I looked thru my copies of Parker catalogs and prior to the 1910 catalog, Parker only listed straight or pistol grip. The pistol grip would include capped pistol grips, round knob pistol grips, and ball grips. Ball grips were on the early hammer guns and looked like a bulb. Parker did use the term "ball" on their later .410 guns. Starting with the 1910 catalog, they used the terms straight, pistol grip (includes both CPG and round), 1/2 pistol grip, and Monte Carlo.
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