brandy777 I hope this helps you identify your husbands new shotgun.
Riot Model 12
Take down in 12 gauge ONLY
Full round barrel in 20" length
Barrel a choked cylinder (to shoot buckshot)
Plain pistol- grip walnut stock
Grooved slide handle
U.S. and ordinance bomb stamped on receiver
Butt Plate flat
Built 1918-1963
Trench Model 12
Fitted with barrel hand guard and bayonet lug
Take down in 12 gauge ONLY
Full round barrel in 20" length
Whole gun is 'Parkerized'
Plain pistol- grip walnut stock
Grooved slide handle
U.S. and ordinance bomb stamped on receiver
Butt Plate metal and flat
Built 1918-1963
"Winchester proof steel" became standard for all Winchester shotgun barrels in the early 1930's.
Sounds like a riot gun but not sure.
Looks like it's a 1959 according to this Winchester serial # lookup
http://www.mchenry-sc.org/Engineering/Model_12.htm
