I think I see four tabs on it. If that's right, then likely a bridge rectifier. It does have the vague appearance of a selenium rectifier. But I have to admit that all of those I have here are bolted through their center, are much larger in size, and are more defined. (Extracted from an old WW II radar unit.) That stack-up looks optimized for small size, if so. It sure looks different from my own meager experiences. Makes me want to disassemble it. ;)
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