Military Stevens 620A - Legit?

Claimed military Stevens 620A at auction, without usual P and flaming bomb on the left side of the receiver front and barrel rear. Is this legitimate? Note I'm not intending to bid, just interested in whether this example is real.

http://www.gunbroker.com/Auction/Vie...Item=518985605

Id say that it's correct. A training model used for aerial gunnery practice.

I think Brian is spot on. It's an early WW2 shotgun, and that is how the early ones were marked.

Thank you, gentlemen, for your responses. Will be interesting to see what it goes for.