It appears that the cabinet may have been designed for a 3 knob radio and was modified for the 6T/6C chassis.
Another interesting thing is that the front panel was about 1/4 of an inch too narrow. So small matching strips had to be added at the lower sides where the cabinet becomes wider. I would think that the factory would have resolved this to save time if they were going to make any quantity of these.
Notice also the inlaid bird's eye maple on the base sections. You don't see that treatment often (ever?).
The chassis is all finished. It will be a couple of weeks before it is reassembled.
SO, has anybody seen another one of these?