Welcome to the Forum. First of all, S&W never used the term lemon squeezer. The proper name for the revolver is 38 Safety. Your Safety is a Fifth Model, made in the late 1920s or early 1930s. By this time, the Safety revolver was a slow mover and the factory probably had lots of inventory, but did not ship in order, so it could have left the factory anywhere from the late 1920s to maybe as late as 1940.
Condition is the major factor in value and one person's assessment of percent finish might be different than standard collector appraisal. There were over a quarter-million of this style revolver made and value is usually quite low. If in near-perfect condition, you might get $400 out of it, but detailed pictures or an in-hand inspection is the only was to determine condition.
I have to say that I suspect almost every revolver ever sold was shot, maybe not much, but to prove a 80 year old gun was unfired is not possible. Also, there were more post-factory pearl stocks out there by far than original factory. Does yours have a S&W medallion and a pencil serial number inside the right stock?