Thank you for the welcome! I saw your name and beautiful bicycle come up a lot when I was attempting to research this one (to little avail). Mostly found Ciöcc-badged cousins without the flourishes.

I am also puzzled and fascinated by these seat stays. There is no indentation in the seat tube and, despite my skepticism, by some geometric wizardry it comfortably fit the 700x28c I tested with the tightest clearance being on the chain stays. I’m tempted to do a quick build just to take it around the block, but the salt! Argh!