Keystone watch case

[rrwatch]

As far as I am aware there are no date lists available for the Keystone Watch Case Co. However, somewhere around 1924, the U. S. government changed the marking requirements for gold filled items so that they had to state their exact composition, ie, 14 Kt gold filled, 10 Kt rolled gold plate, etc. The earlier markings, which indicated how long the watch case was guaranteed not to wear through to the brass underneath, were no longer allowed. Since your case has the earlier markings, it was made prior to the mid 1920s, but I cannot be any more specific that that.

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Ed Ueberall
NAWCC #49688