[Alpo]

Smith made two different kinds of "break open" guns. "Tip ups", of which the model 1 1/2 is one, and "Top Breaks". The difference is the "top breaks" had the hinge on the bottom of the frame and it hung down like a double barrel shotgun, and the cylinder stayed on the gun, while the "tip ups" has the hinge at the top of the frame, and the barrel swung up and on top of the frame, pointing back at the shooter, while you removed the cylinder.

So, first you got to figger out which you have, since your information contradicts itself.

Also, all of the tip ups are single action, while all the break top 32s are double action. And, some of the break tops have a hammer and some are hammerless. All this makes a difference in knowing what you have, so we can decide how old it is.