another data point for the music centre theory - every turntable sanyo sold as a turntable carries a TP- number. TP-301, TP-450, TP-801, TP-1100, TP-1200, TP-Q50 and so on. the audio-database site has the whole sanyo/otto catalogue with photos (otto was sanyo's home market audio brand), worth a browse just to rule yours in or out against the pics.
yours just says SANYO / BELT DRIVE PLAYER on the badge and that's kind of the answer in itself - if it had been a standalone it would carry a TP number somewhere and vinylengine would have turned it up. a mech built into a music centre never got its own model name. in the factory paperwork it's a part number inside the parent unit's parts list, which is exactly why the trail dead ends.
two things that work better than VE for this sort of hunt.
the japanese catalogue archives - audio-database above, plus radiomuseum and hifi-wiki for the european market music centres. VE is great on separates and basically blank on console and music centre mechs.
other one is fisher. sanyo took fisher over in the back half of the 70s (emerson's stake went to sanyo in 77) and after that a lot of US market fisher consoles and music centres are running sanyo mechs. if the sanyo search stays dry the identical deck may well be sitting in a fisher service manual under a fisher part number.
on the buyers wanting a model number - what they actually need to price it isn't the number, it's the specs. put those in the listing and the question mostly goes away. platter size and whether it's cast or stamped, motor type, arm effective length, cart mount, VTF range, and that it's the GT-5D / MG-2.
one thing i'd tell them straight though. feed a made up model number to chatgpt and you get a confident price back for a turntable that never existed. it doesn't come back with "no such model", it pattern matches to the nearest plausible thing and fills in the blanks. only honest basis for a price here is comps - recently sold serviced belt drives of that class with a custom plinth. your service work and the plinth are most of the value anyway, and neither of those is in any catalogue.
