Joined: Jan 2010
Posts: 9,797
Likes: 1,761
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
I'm thinking there must be some cool fluted French seatposts in that size, JPR, Stronglight or Simplex(?).
Might take an Ebay search to unearth a good one.
I recently had to do a bit of work just to find a zero-offset inexpensive 27.2 post in silver, used to be a lot more choices on fleabay.