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
google images
how much is a gauge victor ejector shotgun worth
Rifles are referred to by caliber. Shotguns are referred to by gauge.
100,000
20 gauge marlin ou 2 triggers
75-100 yrs ago