I have produced a short list of helpful resources where you can find out more about Waltham Pocket Watches. I have found these sites very useful when looking for information on these antique watches.
Wikipedia - there is as always some very useful information on the history of the Waltham Watch Company and they provide in an easy to understand format. Click Here to read that.
NAWCC - If you are trying to find out about the different grades of watches then the NAWCC is a good place to check out and you can do that by clicking here.
The pocket watch site is also a great source of information and they can be found at http://www.pocketwatchsite.com/walthamserials.html