This 2007 thread has come back to haunt me, and I just had to set someone straight who was buying one. Too much heresay, incorrect assumptions.
The 300 WAS made in the early 1970's, in a very small window of time. Circa 1972-3. It was the console version of the 201. Both were made in the same German factory. They are German variants of the 200 line with unique (Europe-compatible) electronics and speakers.
They are uncommon, but they are out there.
We can NOT assume the era of an instrument based on sequencing the model numbers, or even the suffix letters! If we did, the 726B would be the last Wurly EP made. (And it wasn't. It preceded the non-B 726 and was made in 1966.)
The last-introduced Wurly EP models were the 205(V), the 215(V), and the 200B. All around 1980, perhaps inched back to 1979? Don't quote me on 1979, check the table in the link below. 270 was 1976.
Sorry to be a grouch over a 13 year old thread. But this sort of thinking still goes on among us over here. Also, I need coffee.
https://docwurly.com/wurlitzer-ep-history/wurlitzer-electric-piano-models-a-list/PS. Olivier, i continue to enjoy your beautiful page. It's an inspiration!