Next up, c. 1973 Ovation Breadwinner:
Although those look like humbuckers, they're not. They're "torroidal-magnet" (whatever that means) single coils. The Breadwinner was the first large production-run guitar to have active electronics. It has a 9-volt in the back. The combination of single coils and active electronics makes for a lot of hum. A later version of the Breadwinner had mini-humbuckers instead. I'd like to play one of those some day.
I bought O'l Blue from a pawn shop in downtown Jacksonville, Florida around 1979. Iirc I paid $225, with ohsc. I saw the Breadwinner, and my blue Kustom amp, in the shop window from a moving car! The Breadwinner was my first gigging guitar and my main guitar throughout the 1980's.