Orient Express - Cheap Chinese Rims / Wheels / Forks / Frames / Cranks / Etc

Understated design. And I am intrigued by the sideways fastening mech. It should work on normal saddle rails right? Unless there is something I've misunderstood?

Would probably ONLY fit a standard dia. saddle rail. Any deeper/carbon rails probably not (they may do different fittings.

Looks like an old Specialized post I had, bit of a faff to be honest.