It is our goal to serve the clock industry with the highest quality tools & merchandise available.

Established by Emery Brittenham as Keystone LTD, founder of the Keystone product line.  Since then we have added the Clockmaker’s Keystone Depthing Tool and refined the Keystone Bushing  and Mainspring Winder.  Our product line has also been expanded to include more materials and hand tools for the serious clockmaker.  Our catalogue is now more complete and easy to use.

We are located in the heart of the Rocky Mountain region, just north of Denver, Colorado U.S.A.  If you need information about any clock related item, or tool, please feel free to call, fax, or e-mail us.

Memberships include:

• The American Watch Clockmakers Institute (AWI)
• National Association of Watch & Clock Collector’s (NAWCC)
• Colorado Chapter 21 of the NAWCC
• National 400 Day Clock chapter of the NAWCC.

If you are in our area, we invite you to visit our business and welcome the chance to meet you personally.

Sincerely,

Lew & Margene Oswald

Mile Hi Clock Supplies

Keystone Tools