Question about Thermoquad secondary jet numbering, yes i looked at the guide already!

[idrivemopar]

So, I didn't notice this until recently, but I have three sets of 5137 secondary jets, and in each case one of the jets has a number 1 after it and the other doesn't, and is the same on all three sets. So, 51371 and just 5137. Anyone know why?

 

[idrivemopar]

Ok, nevermind, got out the giant magnifying glass, and what I thought was a Number 1 is actually a dot from the stamping machine that dragged after the number stamp so it looks like a 1, but its not, so there ya go if anyone sees this on jets.