" Oval Window, 1953 - 1957
In 1953 came the first major changes in Beetle styling. Rear view was increasingly a problem and so the boys in Wolfsburg cut out the centre post and made the split into an oval. Some callous butchers are known to have manually cut the center post of the split rear window out either to improve rear visibility or to make their cars look newer!
This window stayed in vogue until 1958 with the first small square rear window model.
Note that the rear bonnet was the same as the Split, except for minor changes such as handle and ‘popes nose’ designs. Taillights are larger and also oval shaped. Outer lens is GLASS, not plastic and has a distinctive honeycomb pattern. These Bugs also came with pop-up (semaphore) indicators in the b-pillars. "

― Christina Engela , Bugspray