Hi,
I just got a Leica M3, single stroke which seems to be from around 1952. It was in a very decent condition but I have tried it with only a couple of films. However I noticed something strange with the Range Finder, because below 0.9m the moving central part did not move anymore. Thus it is impossible to set an accurate focus below 0.9m. The lens is a new Summilux F1.4/50mm from my M10.
When I looked at the inside I noticed that the M3 RF mechanism has an additional arm that touches a stud and this inhibits a full swing of the roller at the end of the other arm (with the roller). In the M10 there is no such additional arm although the stud is there. See the photo's, the 1st is the M3, the 2nd an M10.
Any suggestion if this is original Leica (doubtful) and if not why this extra arm was added? It is of course possible that internally the range finder mechanics is not any longer working in this low range, hence the limiter. And funny that M3 parts still appear in an M10.
Charles