The Bostrom 31 Mk II, widely recognized in Northern Europe as the B-31, represents a significant chapter in Scandinavian yacht design. Designed by Bruno Boström in the early 1970s, the vessel was a prolific success for the Boström Båtar yard in Sweden, with over 1,000 units reportedly produced. The Mk II iteration is a refined version of the original Mk I, featuring subtle improvements to the deck mold and interior ergonomics that addressed feedback from early hull owners. Characterized by its traditional "S-frame" hull characteristics—though technically a fin keel with a deep skeg-mounted rudder—the B-31 was born from an era where seaworthiness and a balanced helm were prioritized over the wide-beam, high-volume designs seen in contemporary coastal cruisers.
Bostrom 31 Mk II Sailboats for Sale & Market Overview

- Make
- Bostrom
- Model
- 31 Mk II
- Builder
- —
- Designer
- Bruno Boström/Grandinsson
- Number Built
- Production Year(s)
- 1977 - 1984
Below are the most recent Bostrom 31 Mk II sailboat listings (up to 10).
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| Source | Year | Make | Model | Price | Cabins | Heads | City | Country | Listing Date | |
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DISCLAIMER: We are not affiliated with any external listing websites in any way. We simply aggregate publicly available listings to make it easier for buyers to find sailboats for sale. We cannot guarantee the accuracy of the listings, so please verify all information with the seller before making any decisions.