Date codes are '68, you have a good feeler Sam.
Those cabinets will be quite sturdy, and the hardware looks to be very high quality with strong spring type catches and i expect the jamb that the doors rest against is felt padded. Actually, now that i look at more of the pics, the doors don't jamb at all. they're supported at only 3 points when closed so they might have acheived total silence with them.
My WAG is that those cabinets cost far more to construct than the drivers themselves. That said, i expect production numbers were quite low, and by now few if any remain in that condition. They're like something out of a 1968 time capsule. Outside of the surface finish, i can't see a flaw in the cabs, dig that compound mitered riser.
