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The Cost of Repairs

is reduced to a minimum when a Jas. Boss Watch Case protects the works of the watch front dust and dampness, jolt and jar.

JAS. BOSS STIFFENED GOLD Watch Cases

are far stronger than solid gold cases, absolutely close fitting, do not get out of shape, or lose their rigidity. Fully guaranteed for 25 years.  No matter how much you pay for a movement, be sure to have it protected with a Jas. Boss Case. The original gold filled case and the only one proved by 50 years of service. Write for a booklet.

This Mark is Stamped in Every Boss Case.

THE KEYSTONE WATCH CASE COMPANY, Philadelphia.