Looks to be in good cosmetic condition, so ought to be in good working order. Well done.

Are you after my status as Incorrigable Quad Fanatic? Three 306s and a 303 isn't bad, but you're up against 4 tuners; a pair of speakers; 3 405s (all fettled); a pair of 'monoblocked' and heavily modified 405s; a 303; a 303K; a 520f, and a pair of 510 monoblocks.