Welcome to the forum, nice gun. Your old 32 Safety is a first model shipped most likely in early to mid 1894. It is a standard cataloged gun and therefore with the pitting not of interest to the super serious collector. Having said that there are a lot of guys out there looking for a nice representative gun like this. With that in mind I would place the value between $250 and $400. A couple of years ago it would have been slightly higher on the low end, but the economy has been hard on these guns.
A factory letter would tell you the exact shiping date and most probably not much more. At the time this gun was shipped 99% were shipped to one on a few large distributers in NY. Most went to the MW Robinson Co. or the Hartley Graham Co.. You can spend the $50 for a factory letter, but chances are that that's what you will find out.