WWII Ithaca M37 - Was it a Training Shotgun ?

[John Mello]

Here are more marks I found in the barrel that may or may not make any difference.
I took the barrel off to photograph.
What I described as gouges are punch marks, straight down.
Under more magnification than seen here, I can see the walls of each character cave in on itself.
It's a 5 digit number, 47648.
M37 punch mks + wittness mk .jpg
It's not the same font, as the 4's don't have the serifs that the 4 below it dose.

Also between the threads is a Ithaca mark I've seen in C.W. Clawson's book on 1911's.
on pg 55, Fig. 41. Looks like the first one in the row.
M37 mark between threads .jpg

I thought you'd want all the dope.

Thanks,
jm