Alex, that's very clearly a re-branded Framus guitar, as you seem to have figured out. The bridge, rosette, screwed-on pickguard and zero fret all are characteristic of Framus-built instruments. But what completely clinches it, in my opinion, is the neck made of thin strips of wood laminated together: that's very typical of Framus guitars.
So far as I'm aware, it's also fairly unique to Framus during this period. Decades later Martin came out with their visually similar "Stratabond" necks, but during the era that this guitar was built, Framus was the only company doing that.
The funny thing about those laminated necks: you'd think they'd be more warp-resistant because of all those layers of wood, but they're not. I've seen several Framus guitars with completely warped laminated necks on them.
Anyway, it's an interesting instrument, one that Boosey and Hawkes clearly had made for them by Framus. Thanks for raising the question - I learned something new today.
Wade Hampton Miller