Craftsman Tool Manufactures Decoder Ring which I lifted from another forum
As you can see there was many manufactures over the years.
Early Craftsman Series (generally pre-1947, with some exceptions):
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A-circle = Empire, ca. 1954 - 1986 (note- based solely on torpedo level 3983)
AC = J.P. Danielson, ca. 1930's - 1960's
AD = Bemis & Call, ca. 1930's - 1940's (note- found on Fulton monkey wrench, only known example)
AF = Billings & Spencer, ca. 1934 - 1938 (primarily flat wrenches)
A.O.= J.P. Danielson, ca. 1933-1938
BB = Stanley, ca. 1939 - 1950 (This code only found on amber handled flat blade style screwdrivers, and a block plane; phillips screwdrivers of this same style and time period were found to have the I-circle code)
BC = Vlcheck, ca. 1935 - 1941 (based on striking tools only)
BE = New Britain, ca. 1931 - 1947
BM = S-K, ca. 1939 - 1951
BT = Vlchek, ca. 1936 - 1938
C-nn = Snap-on, ca. 1932 - 1936
CI = Moore Drop Forge, ca. 1935 - 1944 (currently applies to Craftsman underline Vanadium wrenches only)
CF or C-F = Herbrand, ca. 1934 - 1939
CK = unknown U.S. manu., ca. 1939 -1943
Craftsman Vanadium = Hinsdale, ca. 1933 - 1934
C-circle = Likely Crescent possibly Channellock, ca. 1935 - 1941 (note- based on one Craftsman-underline Vanadium linesman plier)
C8 = JP Danielson, ca. 1930 -1936
D-circle = possibly Irwin or Vermont American, ca. 1951 - 1969 (only known tool is 14 piece set of auger bits in plastic case)
F-circle = Miller Falls, ca. 1949 - 1964
G-circle = unknown U.S. manu. ca. 1949 - 1964 (as late as 1973 on ripping chisels)
H-circle = New Britain, ca. 1931 - 1947
J-circle = Reed Manu, ca. 1939 - 1982 (note- pipe tools)
JW = J.H. Williams, ca. 1960's - 1970's
K-circle = SK, ca. 1939 - 1951 perhaps later
N-square = McPherson-Huff Co, ca. 1946 - 1964
P-circle = Wilde, ca. 1945 - 1979, perhaps later (mainly pliers & ign. tools)
S-circle = Kastar, ca. 1960 - 2008, perhaps earlier
T-circle = NYE Tool Co., ca. 1947 - 1953 (based on pipe wrenches only)
V-circle = unknown U.S. manu., ca. ? - 1985
U-circle = Plomb/Penens, ca. 1944 - 1948
Z-circle = Mayhew, ca. 1957 - 1969
Modern Craftsman Series (generally 1947 and later, with some exceptions):
AZ-circle = J. H. Williams & Co., ca. 1955 - 1967
BF = probably Daido, possibly KTC, some USA made but predominantly Japanese made, ca. 1969 - 1987
C = likely Crescent/Cooper Industries, ca. 1964 - 1973 & 1977 - 1993 (currently only applies to pliers)
C = Stanley Works, Taiwanese made, ca. ? - ?(note--this is a Canadian Craftsman series code)
CG = unknown U.S. manu., ca. 2001 - 2005
D = Kington, Chinese made, ca. 1992 - 2008
DAA = Danaher, Chinese made, ca. 2010 (Ratchet only)
DAC = Danaher, Chinese made, ca. 2012 (Ratchet only)
DD = Stanley, ca. 1971 - 1988 (note- found on push drill)
DJ = Mitutoyo, Japanese made, ca. 1968 perhaps earlier & later (note- found on vernier calipers)
DL = Unknown U.S. Manu., ca. 1995+ (found on demolition chisel)
E/EE = National Hand Tools/later Stanley Works-NHT division, some USA made, most Taiwanese made, ca. 1982 - 1991 (Based on sockets, extensions, & Tri-wing ratchets only)
EEE/EEC/EE7 = Stanley Works, Taiwanese made, ca. 1987 - 1991 (based on sockets, extensions, & Quick Clean ratchets only)
F = Danaher/possibly K-D division, ca. ? - 2008
G = Easco, ca. 1980 - 1989 perhaps as early as 1979 when Easco acquired the Gastonia plant
G continued = Danaher, ca. 1990 - 2011
G1 = Danaher, ca. 2000 - 2004
G2 = Danaher, ca. 2004 - 2008
G2D = Danaher, ca. 2008 - 2011
GD = Danaher, ca. 2008 - 2009
GK = Danaher/Kingsley Tools Division, ca. 2003 - 2011
GK-A = Danaher/Kingsley Tools Division, ca. 1999 - 2003
GK-F = Danaher/Kingsley Tools Division, ca. 2007 - 2008
GK-G = Danaher/Kingsley Tools Division, ca. 2007 - 2008
GK-X = Danaher/Kingsley Tools Division, ca. ? - 2008
GK-Z = Danaher/Kingsley Tools Division, ca. 2010
H = Danaher/Holo-Krome, ca. 1994 - 2011
HZ = Danaher/Holo-Krome, ca. ? - 2008
HZ O = Danaher/Holo-Krome, ca. 2009-2009
HZ OO = Danaher/Holo-Krome, ca. 2008 - 2009
I-circle = Parker Mfg Co, ca. 1939 - 1950, 1957 - 1986, & 1970 - 1996 (note- the 1st period represents amber/blue handled screwdrivers; the 2nd period represents locking pliers; the 3rd period represents laminated RBE wrenches)
J SD = Simonds International, ca. 1995 - 2006 (Files only)
JW = J.H. Williams & Co, ca. 1954 - 1972
K = SK division of Facom, ca. 1985 - 2004, could still be NOS
K = Danaher, ca. 2010 - ?
K0AA = Danaher, ca. 2011 - 2012 (Ratchets only)
K1AA = Danaher, ca. 2011 - 2012(Ratchets only)
K1W = Danaher, ca. 2007 (Ratchets only)
K2AA = Danaher, ca. 2011 - 2012 (Ratchets only)
K3AA = Danaher, ca. 2011 - 2012 (Ratchets only)
K3V = Danaher, ca. ? - 2008 (Ratchets only)
K3X = Danaher, ca. 2007 -2008 (Ratchets only)
K0Z = Danaher, ca. 2010 - 2011(Ratchets only)
K2Z = Danaher, ca. ? (Ratchets only)
K4AA = Danaher, ca. 2011 - 2012 (Ratchets only)
K6AA = Danaher, ca. 2011 - 2012 (Ratchets only)
K6Z = Danaher, ca. 2010 - 2011 (Ratchets only)
K7Z = Danaher, ca. 2010 - ? (Ratchets only)
K4W = Danaher, ca. 2007 - ? (Ratchets only)
K9W = Danaher, ca. 2008 - 2009 (Ratchets only)
KAA = Danaher, ca. 2011 - ? (Ratchets only)
KR = Danaher, ca. 2005 - 2008 (Ratchets only)
KU = Danaher, ca. 1992 - 2005 (Ratchets only)
KV = Danaher, ca. ? - 2008 (Ratchets only)
KW = Danaher, ca. 2002 - 2008, probably earlier (Ratchets only)
KX = Danaher, ca. 2002 - 2008, probably earlier (Ratchets only)
KY = Danaher, ca. 2009 - 2010 (Ratchets only)
KZ = Danaher, ca. 2010 - 2011 (Ratchets only)
LC = J.P. Danielson, ca. 1930's - 1960's
L1X = Danaher, ca. 2008 - ?
L1Y = Danaher, ca. 2010 - 2011
LAA = Danaher, Taiwanese made, ca. 2011 - ?
L SI = Simonds International, ca. 2001 - 2006, perhaps as late as 2012 as NOS in stores. (Files only)
LZ = Danaher, made in Taiwan, ca. 2010 - ?
M = Vaughan, ca. ? - 2012 (note- found on striking & prying tools)
M6W = Dahaher, ca. 2007 - 2008
M6Y = Danaher, ca. 2009 - 2010
M7Y = Danaher, ca. ?
MG = MG Spa, Italy, ca. 1970-1973 (note- found on vernier calipers)
N = Pratt Read, ca. 2007 - 2009
OA = Unknown U.S. manu., ca. ? - ?
P = Wilde, ca. 2005 - 2015 (mainly hooks, picks, scrapers, & prybars)
Q = Pratt Read, ca. 2002 - 2006
R = Pratt Read, ca. 2002 - 2006
PR = Pratt Read, ca. 2002 - 2009
Q PR = Pratt Read, ca. ? - ?
S PR = Pratt Read, ca. 2007 - 2008
T PR = Pratt Read, ca. 2007 - 2008
U PR1-3 = Pratt Read, ca. 2008
V PR = Pratt Read, ca. 2007 - 2008
W PR = Pratt Read, ca. 2007 - 2009
X PR = Pratt Reed, ca. 2009 - 2009
S-AA = likely Danaher, ca. 2012 - ?, China made, Impact Sockets
ST = Stanley Works, likely Taiwanese made, ca. 2007 - 2009
(note- this is a Canadian Craftsman series code)
T-hex = Milbar, ca. 2010 - 2013 (perhaps earlier)
T1X = Danaher, ca. ?- 2007 (Ratchets only)
T2X = Danaher, ca. ? - 2007 (Ratchets only)
T1V = Danaher, ca. 2006 - 2007 (Ratchets only)
T1W = Danaher, ca. 2007 (Ratchets only)
T2W = Danaher, ca. 2008 (Ratchets only)
T3W = Danaher, ca. 2008 (Ratchets only)
T3Y = Danaher, ca. 2009 - 2009 (Ratchets only)
T4Z = Danaher, ca. 2010 - 2011 (Ratchets only)
T4W= Danaher, ca. 2008 (Ratchets only)
T5V = Danaher, ca. 2008 (Ratchets only)
T5W = Danaher, ca. 2008 (Ratchets only)
T5X = Danaher, ca. 2008 (Ratchets only)
V = Moore Drop Forge, ca. 1946 - 1967
V (continued) = Easco, ca. 1968 - 1986 perhaps as late as 1991 as NOS
VE = Danaher, ca. ? - ?
VF = Danaher, ca. likely early 1990's
VG = Danaher, ca. 1994 - 1995
VH = Danaher, ca. 1994 - 1997
VJ = Danaher, ca. 1994 - 2008
VK = Danaher, ca. 1996 - ?
VL = Danaher, ca. 1995
VM = Vermont American, 1959 - 1989 (found on tap & die sets & circular law blades)
VM = Danaher, ca. 1998 - ?
VN = Danaher, ca. 1999 - 2001
VP = Danaher, ca. 2000 - ?
VQ = Danaher, ca. 2001 - 2004
VR = Danaher, ca. 2002
VS = Danaher, ca. 1995 - 2003 (Ratchets only)
VT = Danaher, ca. 2002 - 2006
VU = Danaher, ca. 2005 (Ratchets only)
VV = Easco, ca. 1974 - 1989
VV continued = Danaher, ca. 1990 - 2011
VW = Danaher, ca. 2002 - 2009
V^(2nd V inverted) = Danaher, Armstrong Division, ca. 1992 - 2012
^V(1st V inverted) = Danaher, ca. 2010 - ?
VVH = Danaher, ca. 1997 - ?
VVL = Danaher, ca. 2000 - ?
VVM = Danaher, ca. ? - ? (Ratchets only)
VVN = Danaher, ca. 2005
VVS = Danaher, ca. 2003
VVT = Danaher, ca. 2004 - 2005
VVV = Danaher, ca. 2008 (Ratchets only)
VVW = Danaher, ca. 2008
VVX = Danaher, ca. 2002 - 2008, possibly earlier
VVY = Danaher, ca. 2009 - 2009
VVZ = Danaher, ca. 2010 - 2011
VVAA = Danaher, ca. 2011 -2012
VVAC = Apex Group, ca. 2010 - ? (Ratchet only)
W = SK Hand tools, post-Facom , ca. 2005 - 2008
WF = Western Forge, ca. 1965 - 2011
WF ll = Western Forge, ca. 1969
WF D = Western Forge, ca. ?
WF J = Western Forge, ca. 1991 - ?
WF K = Western Forge, ca. ?
WF L = Western Forge, ca. ? - 2009
WF R = Western Forge, ca. ?
WF T = Western Forge, ca. 2005-2005 (note, this applies to screwdriver set 41412 only)
WF U = Western Forge, ca. 2008
WF V = Western Forge, ca. 2008 - 2011
WF W = Western Forge, ca. 2002 - 2009
WF X = Western Forge, ca. 2008 - 2009
WF Y = Western Forge, ca. 2009 - 2011
WF Z = Western Forge, ca. 2010 - 2011
WF AA = Western Forge/Ideal, ca. 2011 - 2012
A WF = Western Forge, ca. ?
B WF = Western Forge, ca. 1989 - 1991
C WF = Western Forge, ca. ?
D WF = Western Forge, ca. 1993 - 2000
E WF = Western Forge, ca. ?
F WF = Western Forge, ca. 2003
G WF = Western Forge, ca. ?
H WF = Western Forge, ca. ?
J WF = Western Forge, ca. 1995
K WF = Western Forge, ca. 1995
L WF = Western Forge, ca. ?
M WF = Western Forge, ca. ?
N WF = Western Forge, ca. ?
O WF = Western Forge, ca. ?
P WF = Western Forge, ca. ?
Q WF = Western Forge, ca. 1990 - 1995
R WF = Western Forge, ca. ? - ?
S WF = Western Forge, ca. 2009
T WF = Western Forge, ca. 2002 - 2009
U WF = Western Forge, ca. ?
V WF = Western Forge, ca. 2002 - 2009
W WF = Western Forge, ca. 2002 - 2009
X WF = Western Forge, ca. 1965 - 2009
Y WF = Western Forge, ca. 2009 - 2011
Z WF = Western Forge, ca. 2010 - 2011
+ WF = Western Forge, ca. 1965 - ?
* WF = Western Forge, ca. 1965 - ?
> WF = Western Forge, ca. ?
|| WF = Western Forge, ca. ?
∆ WF = Western Forge, ca. 1966 - ?
□ WF = Western Forge, ca. 1965 - ?
7 WF = Western Forge, ca. ?
X = SK Hand tools, post-Facom , ca. 2008 - 2009
X = Mayhew, ca. 2010 - 2011
-X- = Danaher, Made in China, ca. 2011 - ?
-Y- = Danaher, Made in China, ca. 2009 -2010
Y-circle = Unk. U.S Manu., ca. 1950's-1960's
Z = Mayhew, ca. 1957 - 2011
-Z- = Danaher, Made in China, ca. 2011 - ?
3 = Kastar, ca. 1991
4 = Kastar, ca. 1992
7 = Easco, ca. 1987 - 1991 (SS & Lifetime ratchets)
8 = Kaster, ca. 1994 - ?
Hex-Line = Kastar, ca 2009 - 2009
[ = Kastar, ca. 2002 - 2009 possibly earlier
.(Dot) = SK, ca. 2008 - 200