Holy, that's weird, never seen one without the caliber stamped on the top of the barrel.
How long is the barrel? I wonder if it was rechambered and set back which would make the smith rethread the barrel and it would take out the caliber stamp.
If it's still factory it could be five calibers, 303 Sav, 30-30, 38-55, 32-40 or 25-35.
You can go two routes, one, send for a letter to the historian which will tell you what it left the factory as or, two, send it to a gunsmith and let him figure it out.
Personally I'd go the gunsmith route in case it was rechambered for something else.
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