1954 cj-3b 12v?

In the process of cleaning, inspecting, and developing a plan of action to restore the Jeep I have discovered it has 12V light bulbs. Also there is an AC/DELCO Chevrolet AM radio that has been installed in the dash (clearly and add on by the previous owner). In the Kaiser Willys catalog it indicates the CJ-3B switched to a 12 V system in 1957. The owners manual I purchased indicate the Cj-3B is either 12V or 6V. If the Willys has been converted to 12V how would I be able to tell?

Another question I have is the turn signal lenses. The style on our Willys match what the Kaiser Willys parts catalog shows to belong to the Willys Wagon. Is it possible that the lenses were used on multiple models?