[edgarspencer]

Here's a shot of the back locking lug on my 16ga lifter.
Apart from the inspector initials, and frame size number, there is a delicate 6, if viewed from the breech end, or it's an equally delicate 9 if viewed from the muzzle end.
I have other, later boxlock 16s and there is a small 16 stamped on the back lug.
Would I be correct in assuming the 1 was left off and the 6 refers to 16ga. ?