Jay.... hmmmmm, don't know about the numbers or letters... close up pictures would help (my camera takes crappy close ups...

)
Grips, sometimes they are marked, sometimes they are not, unsure about the exact year you have... I had a 1940/42 and it was marked with an eagle 655 but not the serial number, and it was stamped
LIGHT but this is not done very deep at times and you really have to look for it. See if that is true with yours?
ed