Cooksie & Shugart produce a pocketwatch and wristwatch price guide yearly. You can probably find a copy to look at in your local Barnes & Noble bookstore. Lots of potential caveats with pocketwatches/wristwatches. Does it run? Does it keep good time? Is it all original? Does the face have hairlines or cracks? Rust or corrosion? Condition of the case. These are just a few of the things that must be checked.