The first shotgun I ever personally owned was a pre WWI J Stevens Arms & Tool Co 12 ga double. If memory serves me correctly it was a model 325. It had a totally square box frame, decent checkered walnut for an economy gun. esthetically thus it looked very similar to a "Slab Sided" 21, minus the points which always looked like were chiseled on as an after thought to me. Internally it cocked via cocking rods activated by lugs into the forend iron & had coil mainsprings. It did of course bolt with the familiar wedge cross bolt of a Stevens engaging a slot in the straight extension rib. It had steel barrels & in the ignorance of my youth I did not refrain from firing any load put up in a 2 3/4" shell. I shot mostly the 3DE-1 1/8oz loads but did keep a box of the newly introduced 4-1˝-4 loads for "Varmint" control on the small farm I grew up on.
I always referred to this gun as my Po'Boy 21.