Mamiya 75mm/3.5 lens
The Mamiya 6mf is indeed an amazing camera.
There are a zillion reviews about it on the internet and my lame thoughts will add nothing new.
Enjoy the pictures.
PS: Over time the camera bellows gave in. They get worn out and dry from retracting and pulling out the lens. Mine had a tiny pinhole and you can see what it did to the pictures.
Quite charming if you ask me!