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Apparently a IIB, and of course, the loop is the signature feature of that mark. https://mesaboogie.zendesk.com/hc/en-us/articles/218914817-When-was-my-amp-made-

Interesting, your 1015X s/n is very close to mine, made in late December 82. Mine is a base 60w model. Only option was cream tolex. Same board revision as well.

My MKIIB has MS12 which I think was an Eminence rated higher than the amps 60w. I mainly use 12 cabs with the BS C90, which are the 90w celestiions. Never blown any of those. Got an Evm12L but don’t care for it much. Tested V30s back in the day, but a little dirtier than I needed, so moved...

That is leather by the way. The earlier models had real leather covering. Not sure when they changed to Tolex, probably 94-95.