The Keystone Watch Case Company

Follow the Keystone

When you buy a watch, first select the works and then tell the jeweler you want a Jas. Boss Stiffened Gold Case. To protect yourself from deception be guided by the Keystone trade-mark which you will find in every JAS. BOSS STIFFENED GOLD WATCH CASE

Better than an all-gold case because stronger; cheaper because no gold is wasted. The Jas. Boss Case is guaranteed for 25 years. Won't wear thin.

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The Keystone Watch Case Company, Philadelphia.