Recently came across a few Continental Competition ALX Pro Ltd 25mm Tubulars. New and unglued, only mounted on a hoop to get a bit of a stretch going.
Links for info:
Note: I am not affiliated with the online store below. I’m using their links as information only.
https://proownedcycling.com/blogs/news/continental-competition-pro-ltd-best-tire-in-the-world
https://proownedcycling.com/...diamond-tubular-tire
Asking $90 ea shipped. Or 2 for $160 shipped.
Cheers!