The Victor brand name has been used by many firearms manufacturers for a variety of guns, but your single-shot shotgun was most likely produced by Crescent Arms c. 1893-1920. As far as being a promo item, it wouldn't have been manufactured as such, but I suppose some business could have purchased a bunch and given them away, but I doubt it.
try: SAVAGE SHOTGUN.COM
Yes, 20 gauge is the second most common gauge for shotguns in the last few decades.
Utility grade made @ turn of the century
a 20 gauge is a type of many shotguns but it is smaller than a 12 gauge but bigger that a 410. a 20 gauge is a good shotgun for all ages.
12 has a bigger bore.
These shotguns came in 20, 28, 16, And 12 gauge calibers
Rifles are referred to by caliber. Shotguns are referred to by gauge.
how much is a gauge victor ejector shotgun worth
The gauge of a shotgun is directly related to the size of the barrell. In the cases of shotguns the sizes going from biggest to smallest for 'standard' (not all) shotguns is. 10 gauge, 12 gauge, 16, gauge, 20 gauge, and a .410 bore shotgun (410 is not a gauge but a caliber)
75-100 yrs ago