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All those EIAJ decks from that era used mechanical slip rings for the video heads that would wear away the fixed contact springs, Panasonic had a printed PCB and Sony standing rings on a plastic riser. I can't speak for Sanyo but the common head switching arrangement in the day was also mechanical using what looked like audio heads over magnetized strips running on the head wheel to trigger the flip-flop and the adjustments were slides under set screws. They all used a poly type of glue to fix the head chips to their mounting and have been known to come unglued.
What you have there is an excellent rare find, I've had numerous Sony AVC and Panasonic NV-3000's over the years but never seen a Sanyo of this caliber. I suspect it was long forgotten in some back closet or storage room where it could rest comfortably. My past decks were all school district auction rejects and well used, despite this they all worked quite well until the head chips came unglued from the spanner and were destroyed.
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