Below is a shot I took with my M10 and a Voigtlander 50mm Heliar f3.5. I got this not to replace my M-mount 50mm, but to use on a Leica IIIg. It came with a screw-mount - M adaptor, so I thought I would give it a try with the M10. I like the results, and I became curious about the lens. I know from the Cameraquest literature that this lens was created to celebrate the 10th anniversary of the merging of Cosina and Vogtlander. But what I could not discover is when the original Heliar was manufactured. I assume it is sometime in the 1930's, but I have been unable to find much information about it online. I am curious about whether the reproduced lens is in fact an exact reproduction of an original collapsible screw-mount 3.5 Heliar, or perhaps just a Heliar optical design in a collapsible mount.