Sight question/new carbine

[shamrocks]

I was at the local gun store today asking about ordering a pistol when I happened to see on the wall a M1 Carbine. It turned out to be a Standard Products with Underwood barrel and couldn't resist it for the price.. I would like opinions on this sight as to real or repro. Curiously the carbine had the bayonet lug on it and struck me as curious why someone would add this sight but not replace the barrel band/lug if they were restoring it but maybe they never got around to it. I think it's likely repro but not sure. No letters on it I can see and two stake marks that align with the right side of the sight base. A couple photos didn't come out that great so I can take another if needed and if anyone can date this carbine for me I would appreciate it. I can't find my book with the production dates at the moment.
Will post some other pics and details later as to parts.
Thanks!

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