Farm Master 6V Allstate Auto Radio

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Hey folks!
Any of you ever seen one of these?
I'm bidding on it at ebay. What do you know about it.
Very odd radio.

Thanks!

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Farm Master 6V Allstate Auto Radio, Model 784.59500. Chassis number 528.6286-4

Some specifications:

-Sold by Sears & Roebuck, circa 1940s

-Made to mount on tractor fender with 3 rubber cushioned bolts

-3 parts labels inside lid

-Working knobs

-Appears to be all original except for nuts that hold antenna