I have an old wood spar that I think is from a class A stern steerer. It's a gaff type rig (3 pieces) with the boom and mast being about 28' in length.
A sectional view would be round.
It has been stored in our Minneapolis shop since the late '50s and in some garage, for who knows how long, before that. The boat was probably sailed on Lake Minnetonka.
Let me know if someone out there would have a use for this.