During the restoration of my FHCs, I discovered multiple designs of 1/4 light hinges and mountings.
The very early cars had a very short lived hinge and mounting to the window frame. Not sure how many cars did have the 1st version but my guess is less than 100 cars before it changes to the first improvement for fitting and use at the car.
The 2nd improved version had a shorter leg because the mounting at the window was not aligned in driving direction but turned by 90° pointing towards the cabin. The mounting was still soldered.
Some time later, the soldering was replaced by 2 countersunk screws and a 3rd version of the hinge was introduced, which did not have the cylindrical operating finger but a round flat. However, with the introduction of the crash roll, another 4th hinge was required to fit over these rolls and had a much longer and curved leg.