That one is too obscure for my books. Try asking the National Rifle Association through their magazine The American Rifleman (you can usually find a copy in the library, good barber shops, or guns shops).
not sure
Is this shotgun manufactured with a twist steel barrel
Sold by Sears Roebuck. Probably manufactured by Stevens.
It was made in 1937.
1966 to 1988
"Your" Winchester Model 21 Double Barrel Shotgun was manufactured in 1933, giving it an age of 77 years, as of 2010.
It was manufactured by Crescent Fire Arms for the Fletcher Hardware Co.
If it is side-by-side, probably Stevens.
Hunter Arms Company, Fulton, New York
It your shotgun a Model 37-S or 37-T ?
The shotguns were manufactured by Ithaca from 1921 through 1947. Yours was manufactured in 1928.
Being a sxs its approx gun value is $350.00I