I have the exact same cabinet, including the speaker cabinets. I don’t know the manufacturing date, but I assume it was 1960s. I bought mine empty, although I think the seller told me it came with high end tube gear when he bought it, which would indicate 1960s. I’d be interested in anything more you can find out about it.
I’ve installed my Citation 1/2/3 in it, along with a Rek O Cut turntable. I put Altec 601s in the speaker cabinets, after fabricating 15” to 12” spacers. I tried 604s, but the cabinets were too small to properly load those 15” drivers