The Keystone Watch Case Company

Where Gold Is Thick

The gold is so thick on a Jas. Boss Stiffened Gold Watch Case that it takes the same depth of engraving as a solid gold case, without impairing its wearing quality. A Boss Case never wears thin.

JAS. BOSS Stiffened GOLD Watch Cases

Are guaranteed for 25 years. For 50 years they have been recognized as the most serviceable of all cases. Don't accept any case said to be "just as good" as the Boss. Ask your jeweler. Write us for booklet. By This Mark You Know Them. THE KEYSTONE WATCH CASE COMPANY, Philadelphia.