Note that your seatpost is extended past the minimum insertion mark.

They're only 220mm long which is fine for the "fistful showing" frame sizing method which used to be popular, although with that much more you might want a different post.

The 98+ steel shaft and later titanium shaft seats posts are close to period correct and 250mm long, although the angle adjustment relies on 1 degree serrations which some riders find too coarse.