Question about Zenith tuner dial

[bmack]

I am working on refurbing my first radio. I usually work on tube amps but just recently I was given a pile of old radios that need some TLC.

My first patient is a Zenith 6D525 also known as "the Toaster". I hoped I could get by with a simply recaping it, but upon turning the chassis over, I discovered that the insulation on every wire in the radio had dried out and turned to clay. It crumbles under my fingers. I'm in the process of rewiring the whole thing.

Anyhow, my question is, what does the scale on the bottom of this dial show? The radio is only AM band unless I am missing something. There is no switch to move over to another band and the schematic says its tuning range is 540Kc.-1600Kc.







Thanks for your help.