I don’t know. Could it be an indentation from a routing jig clamped down too hard that didn’t get noticed and fixed before the finish was applied?It's hard to get this in a photo, but anyone have any idea what this might be from? This is the 1976 BC Rich. The sort of circle outline around the pickup. It's perfectly symmetrical and flat at the bottom. I have no idea what it is. You can only see it in certain light.
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It's a possibility. You two live fairly close to one another, right?