I have some questions about these weapons.
According to my information, the only difference between both weapons was the sight. The FlaK 36 used the Flakvisier 35 or 36 to sight the gun.1 When Zeiss developed a newer sight, the Flakvisier 37, the gun became the FlaK 37.
Does anyone have some close up images of these sights?
On the other hand, I found these curious images of a 3.7cm Flak 36-37 gun.....in static position.

I never had seen this. Was this a special variant?

Images from Ebay
Regards