I have two Ikonta 521s There are subtle differences between them:
Serial # *90991N - The bellows/lens assembly extends with one button on top of the camera and the viewfinder pops up with a separate button on the side of the base of the viewfinder.
Serial # N21239 - Both the bellows/lens assembly and the viewfinder are deployed with the same button on top of the camera.
Can someone point me in the right direction to research this? I find it both odd and interesting.
I assume (and we know how that can play out) that the second camera I listyed was manufactured later than the first, with that small efficiency added.