Steen SkyboltExperimental Aircraft • Spokane Valley, WA, USA

Here is the description:

This listing offers a Steen Skybolt project, a classic aerobatic biplane, powered by a Lycoming IO-360 A1B6D engine. The aircraft is being sold to settle an estate and has been stored in the same hangar in North Idaho for over 40 years. The engine is a first-run example with 1,736 total time since new, complete with log books, and the seller notes it has never had a cylinder removed.

The seller is motivated and pricing is set at $16,500 or best offer for the complete project. They are also willing to sell the engine separately for a fair offer. The aircraft is located in Spokane Valley, Washington.