Help needed from Leica experts!

[Jonboy2312]

That'll teach you to doubt TPF! :lmao: :lmao:

I shall never doubt thy forum again, oh master of knowledge on all cameras big & small :mrgreen:

 

[Mitica100]

 

[Rolleistef]

Yeah it's definitely a I that has ben converted into a IIIf. It was quite common to do so : you bought a camera, and then upgraded it into more advanced models.
Its history seems to be :
"I was bought as a Leica I"
"Somebody at Wetzlar added a rangefinder upon my poor cover" => Leica IIIF 'couplex'
"Somebody at Wetzlar again, added a brand new shutter with slow speed and 1000th of a second"
"I was added a flash delay, and a PC socket. I am now a Leica IIIf"
The lens with no SN is really odd though...

 

[Jonboy2312]

Allow me to thank everyone for their input and thoughts
I've told the owner about our conclusions pretty much as soon as they became clear... he's very, very happy