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George,
That detail sounds very interesting. From what model of Bf109 started to
incorporate the 55 degrees angle? I am sure most of published line drawings did not takes in account that.
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As far as I can tell, it took place early in the production of the 109B, and is easily seen by the removal of the extra glass panel ahead of the gunsight. And, it would appear that with the new windshield, the new gunsight was fitted.
It appears that the only external difference between the C12B and C12C gunsights was the lack of sunlight filter in the earlier sight, presumably because of the lack of room for it in the more streamlined windshield.
All the best,
George