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Yes indeed, that is why I was a bit worried as the screw is "pinching" (not sure the term is correct, I think it would be a grub screw in english) directly the seatpost, I didn't want to destroy the seatpost (it leaves quite some marks as the seatpost is in aluminium and the screw in steel). Therefore the idea would be to have a less destructive design haha
This clamp design was vastly used here in France on MBK frames ; the one I have was a specific paintjob for a pro team back in the 90's (MBK Vetta or Chazal, can't remember exactly and I'm no expert) I've just changed the fork for a straight one
EDIT: base model name for this design was "MBK Mirage", and it has funny aspects like the top tube that changes shape towards seat tube.
With OG fork it kind of looked like that (in less better conditions)
That's such a cool frame! Ive not seen a clamp like that before. Does the screw tighten directly onto the seat post?