The difference between the models 1921 and 1928 savage 12 ga shotguns have both can not tell any differences Even the barrels are interchangable The sn on the 1921 is 16497 the 1928 sn is 16908?

the 1928 is just an improved verson of the 1921 model. they made about 5 or6 different 1928 models or grades. the 1921 model was made from 1921 to 1928 with about 13000 guns made. they are worth about$350 in exc. to $150 poor grade. The Model 28 was called "an improved version of the Model 21", so the differences should not be dramatic.