Winchester made two attempts to make a "Model 12" to compete pricewise with Remington's Model 870. The first was the Model 25 which could be called a solid frame Model 12 from 1950 to 54 --
Model 25, February 2, 1950 Winchester catalog.jpg
and then the Model 12 Featherweight from 1959 to 62 --
Model 12 Featherweight 1960 catalog.jpg
Neither took the market by storm.