Quote Originally Posted by Markok765 View Post
Easiest way: Circular roller RF cam on Leica vs wedge shaped on Russian ones.
George, the Leica II and III have no framelines, only a VF for 50mm. the III adds slow speeds to the camera.
Bingo, saw a chap on Antiques Roadshow use the exact same method to determine if it was a fake or not.
Trivia: I watch too much Antiques Roadshow.