Probably HD Folsom
1951 Model 37
It should be marked on the barrel or reciever. If not, take it to a gunsmith
You will have to call S&W
Not marked, Model 9
100-400 USD
Your Stevens model 9478 single barrel shotgun was made from 1987-1988.The value is between 60-85 dollars in the condition that you describe.
modle #
twist rate in model 110 fp with 24" barrell
That would be a model 1889, Marlin serials are "different" I believe it was made in 1893, but I'm not a Marlin expert...
Quackenbush made several models during this time. However they made a "Model 6" starting in 1907 to 1911. This may be your model.
1936-1942
The Model 29 is a 44 Magnum.