Hiya Bruce,
The model/year listings which Speedy Jim referred to can be a little confusing without this piece of information...............
There is no "absolute" answer to your question. You see, radios, with some extreme exceptions, were never installed at the factory. Certainly, there were no radios installed at Emden, where your car was made. Emden had been set aside for the production of Bugs intended for the North American market. So, no factory installed radios to the North American market.
Instead, radios were installed by dealers. Typically the dealers offered purchasers a variety of radios for their cars. Sapphires, Blaupunkts, and even a few knock-offs from other manufacturers. Complicating this scenario is the sales curve. The dealer may well have had radios left over from the previous model year to install.
So..... take a look at the listings. But know that you have to take in the information with a grain of salt.