This is an old spark gap tool in the shape of the AC. Across the A it reads; Spark Plug and at the bottom of the C it is marked GG-10. The bottom edge is tapered and the calibrations go from .020 to .040 and the C is a notched tool. There is nothing on the back side.
It measures about 1 ½” wide by 1 ½” high and is in good condition with minimal wear or plating loss.
The pictures are not shown at actual size. Please refer to the description for actual measurements.
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