AUTOLEC automobile wiring circuit diagram display light lamp 1951

 I recieved this from my in-laws who were moving. It was given to them years prior by my father in-laws dad.

I cant seem to find anything on-line. It is in pretty good condition and works. Measures 13 5/8 tall by 10in wide. It is four sided all glass with metal frame, with a different diagram on each side, "charging circuit", "clear vision cirtcuit"," starting and ignition circuit", and "fuel circuit" . It has a removable tin top to get to the light bulb. Bottom has a metal base, that rotates. All the colors are bright and vibrent . I figure it was a display for a parts store.

It has the name "Autolec" copyright U.S.A. 1951 Toledo Ohio

Any info or value you could provide for me I would appreciate.

Thanks