Hard Ball, the handgun you're describing is the Warner Infallible Pocket Automatic Pistol. This was made by Davis-Warner Arms Corporation, located in Norwich, CT, from 1917-1919. It was chambered in .32 ACP with a 7-shot magazine, blued finish, and hard rubber grips. In excellent condition a Warner Infallible could be worth about $450-$350. Hope this helps!
Steve Mace
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After today, its all historical