Nothing unusual here. This camera has gone through at least 2 factory upgrades. It started out as a Leica I then was upgraded to III or IIIa specs depending on top shutter speed. 500 for III and 1000 for IIIa. Then another upgrade to IIc specs.
It still is a model I just with upgrades..
Dont know where youre hosting this image but if I open it I also get some nice porn with it on the same page...