Can any Waltham expert identify this movement ?

Model 1900, 0-size is my best guess.

Dan

Dan,

According to the on-line Gray Book database, it's a Model 1907, Grade 165, O size.

Here is the link to the Waltham serial number database.

Regards,

Cary

Now that is a sure useful link - are there similar places where info. for Hamilton and Elgin may be found ?

DM

http://elginwatches.org/databases/elgin_sn_intro.html

for elgin.