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The knobs are similar to the 1956 TV 390 black and white TV and the 1955 TV400. The bar-over-knob assembly is unique because it has more controls than a black and white TV. The small auxiliary control knobs are the same. There's just more of them.
The channel knob will work, but the numbers will be off by 90 degrees because the TV123 mounts on its side. Fine tuning will work OK.
Some 1954 split chassis knobs will work, but they will not be correct.
The chassis mounts on a board that slides into grooves in the cabinet. The board was little more than a plywood frame so most parts were exposed when the chassis was slid out. It was rarely necessary to remove the mounting board to replace parts on the bottom. It was held in place with about 8-12 hex head bolts with captive washers.
TV123 cabinets originally had recessed casters to enable moving it around for service. It is a massive piece of furniture. Exact dimensions will need to come from an owner.
Good luck.
Don
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