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s stamped in the best watch cases made. It is the trade mark of the Keystone Watch Case Company, of Philadelphia, :he oldest, largest and bestcnown factory in the world - 1500 employees, capacity 2000 cases daily. lts products are sold by all jewelers. It makes the celebrated Jas. Boss Filled Watch Cases, now fitted with the only bow (ring) which i not be pulled off the case - the Askyourjewelerforpamphlet.