Double serial number

[Ditchdoc94]

I just bought an underwood m1 carbine at a gunshow. Near as I can tell, it's a legit surplus rifle. I do however have a question. I have the type 1 sight on it and the manufacturer and sn are under that sight. I thought if they weren't readable, the sn had to be stamped in front of the sight. Mine is stamped further back on the reciever. Itsactually partially on the bevel. Any ideas as to why? Also any suggestions on where to buy some ammo and mags?

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