Year and value, hamilton pocket watch ; 4992B movement sn# 4c57874 . I think it is a 22J military watch.?

Search eBay with "Hamilton 4992B". I've been watching them for a while. Auction sell prices run between about $300 and $400. Condition and sharp clear pics are the important bit. Elsewhere, asking prices run up to $1,000, but those are in pristine new condtion, and posted by card-carrying optomists IMO. For serial number and dating, try http://www.pocketwatchrepair.com/histories/hamilton.html