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MrMister-
You’re right - the original fork is a threaded steerer unicrown type, but the paint is very poor, it has very limited tyre clearance, and is very heavy. I wanted to try a carbon fork and its just been finished to (sort of) match. The carbon fork is 1” threadless hence the ugly Thomson stem and a shim - it was just what I had and it will be replaced by a chromo one in due course. Another inch or so to come off the steerer too. No puppies were harmed etc.!
190-215GPa
Looks like a 1" threadless fork to me. Common to see on older bikes, before 1 1/8" became the standard.