I would be very grateful for any leads on a source for 1940's/50's era, closed-end seatposts. For use on a 1947 Bates, a 1948 Holdsworth, and a 1954 Ephgrave built O'Brien.
They need to be long enough for about 170mm to 180mm to be showing above the seat tube - so about 230mm overall length, or longer.
Preferably alloy - Reynolds Hiduminium or similar - but steel would do.
One in 26.8mm, one in 27.0mm and one in 27.2mm.
Many thanks,
Wyndham Pulman-Jones
Girton, Cambs., UK.