I have acquired three stone cold mint U.S. & S. pistols in the past several years. All three (serials 1.06; 1.07 and 1.09) have had keystone grips without reinforcing rings. What is the real story of these grips. Poyer's new book indicates they were used throughout production. Is there any real documentation showing when they were used--like early or late. I am very reluctant to change grips.

Charles
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