https://www.govdeals.com/ – Ohio State sells their surplus here.
Watch Parts and Tools
https://www.esslinger.com/ – has lots of tools.
https://www.startimesupply.com/ – good for batteries and miscellaneous watch parts, must be a verified business to order
http://www.julesborel.com/ – see the JBC watch parts database
– based in Cincinnati, tools and parts.
Otto Frei Jewelry Supply and Watch Parts – large selection of watch crystals
Ranfft.de – for old Swiss caliber number look-up.
Mikrolisk.de – for database of trademarks and trade names
CBS Watch Material – advertised in AWCI email. Advertises Rolex parts.
https://www.watchmaterial.com/ – looks like a well-organized site.
Watch Parts References
Illuatrated Manual of American Watch Movements available from Cas-Ker
BestFit Catalog, part of AWCI’s database, or print available from McCaw