I recall first seeing those in the mid-1970s... However, they were so heavy that (especially in that gram-shaving era) they were just laughed at as an unwanted piece of ballast. However, for a comfy and expensive sport-touring bike like the International, with all the Campagnolo frills, I would not be surprised if this had been considered a great new convenience gadget to include. Checking through old Campy catalogs, it appears that 1969 (cat #16) was the first year these bolts were offered. I see that Campy also offered two different quick release seat post "clips". Those models had complete collars to clamp around the seat tube and they had first appeared a few years earlier (Cat #15, c.1967). Now THOSE pieces I have never seen, on anything. And, those could make sense to use on a light weight fillet brazed frame since they might simply replace an equally heavy seat lug cluster. ... Hmmm... that's much the idea behind the "collars" we find on so many non-steel bikes sold today. Bob Hanson, Albuquerque, New Mexico USA Matthew Browne wrote:When I purchased my 74 Raleigh International, it was fitted with a Campagnolo quick release seatpost binder bolt (curved skewer). I can't locate any information as to whether or not this might have been OEM or even period correct. Come to think of it, I can't think of another bike I have seen with one of these in use. Is this just an undesirable part that people swapped out in favor of a typical fixed binder bolt? If so, why? Or do I have something rare on my hands? Matthew Bowne Brooklyn, NY