Hektor 73mm f/1.9, all black, parallel mount, 1933.
Erik.
And what is the 'parallel mount' aspect?
My Summaron is also LTM and balances perfectly on a (prewar) Barnack. I usually insist on Leitz accessories, but don't like the rectangular profile of SBLOO. I selected the modern C/V external 35mm VF: circular profile, crystal-clear image, great brightlines.... my Summaron 35/2.8 had convertible base. 🙂 I wish I had bought that SBLOO in classifieds not so long ago. I guess I can guesstimate the frame using the entire VF assuming wee bit more will be in the frame.
My Summaron is also LTM and balances perfectly on a (prewar) Barnack. I usually insist on Leitz accessories, but don't like the rectangular profile of SBLOO. I selected the modern C/V external 35mm VF: circular profile, crystal-clear image, great brightlines.