Hamilton Pocket Watch

I am not sure what information you are looking for, you don't say and appear to have most of what is important anyway. If it is indeed sterling silver, you should be able to find hall marks stamped on the case. There are a number of books and websites that will tell you the meaning of the marks and will verify your watch. You should see a makers mark, a date mark, metal content, and a country mark at a minimum. Sterling silver could be Irish too, for example! If it is unmarked, you can have authenticated at the London’s Goldsmiths’ Hall of the Worshipful Company of Goldsmiths (in London England of course!) That way you can tell it from a reproduction. The serial number in the back is traceable, usually, to the original owner it was sold to, if that interests you. Contact them at their offices in Pennsylvania I believe. A web search can find them quite easily. The unmarked lozenge (don't know if I spelled that right) actually increases the value by the way, unless Grandpa was particularly famous. A search on major auction companies for the Hamilton watches and your model in particular will give you prices, but you say you already know that. They were renowned for their time keeping, which is why they were most used on the railways. I believe most of the ones used for that purpose usually had a 24 hour dial too. I can't make it out on the fuzzy photos, but that looks like it might be consistent with yours. What else did you want to know? Garry