[Jeffhs]

I had two 13" Zenith color sets (L1310C and another later model with electronic varactor tuning) in the same style cabinet as your b&w TV. I did not realize Zenith made a b&w set using the same cabinet as the color portables. Looking at your b&w set, I almost thought it was color until I noticed there was no AFC push button near the UHF channel selector; the L1310C does have such a button in that position. The push button on yours looks like it could have been for a Color Sentry system or such, but since the set has the slide pot volume control, that button is almost certainly the AC power switch.