the frame have been customised - the seat stay is made from square tubing and its is uniquely wielded as one on top of the other (as picture shown)
and the seat post is silver wielded to the seat tube so NO SEATPOST CLAMP
( unfortunately that means that the frame will only suit people similer to my height 168 or inside leg of 80cm) OR the measurement form the bottom bracket to the top of the seat is 73cm
From the Ebay ad. Feelsbadman.jaypeg