Yes, I keep information like that, so I was able to help him out. But this raises a very good point. If you own one, or a few antique pocketwatches, it's a good idea to record some key information about them, and to keep that information in a safe place. I suggest at least these items:
- A basic description including size, jewel count and grade of model.
- The serial numbers of movements, if any.
- The type and material of the case. Remember that early American manufacturers, and others, did not sell watch movement in cases. Cases are "mix and match" as it were.
- "Watchmakers' marks", the cryptic codes hand inscribed in the insides of watch cases. These are the finger prints of a watch case.
- A few good quality photos will help as well.
Keep in mind that a stolen watch may be quickly separated from it's case, so record information about both.