Red, the 1957 R20 I own has the older blue glued-on data plate on the back, rather than the screen-printed variety.
Quick and easy way to tell besides the data plate: earlier models had "TV" as the left-most option on the selector. Later models had "Stereo" printed there, in anticipation of using it twinned with the C-810. This one says "TV" but has the screen-printed data plate. I'd put it at late '57 or early '58.
I'd also recommend finding an open spot on the back of the R20 chassis, drilling a hole, and installing the fuse holder that Fisher inexplicably left out.
Quick and easy way to tell besides the data plate: earlier models had "TV" as the left-most option on the selector. Later models had "Stereo" printed there, in anticipation of using it twinned with the C-810. This one says "TV" but has the screen-printed data plate. I'd put it at late '57 or early '58.
I'd also recommend finding an open spot on the back of the R20 chassis, drilling a hole, and installing the fuse holder that Fisher inexplicably left out.
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