What the Heck is this? Pic 1

By Hunter Gasca; posted September 22, 2015

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Found this at a swap meet. Looks to be a piano isolator or a battery rest insulator.

Any ideas? No other embossing besides "PAT. APPL'D FOR" on front rim.

Color is an off clear/light smoke, hemispherical depression in middle, flat bottom.

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