A pair of classic boats are expected to fetch more than $500,000 at an upcoming Southeby’s auction in Plymouth, Michigan

Detroit is better known for its muscle cars than its motor boats, but the latest classic boats going under the hammer through Sotheby’s could well steal the show at next month’s Motor City auction.

Sea Flow II is a Hacker-Craft 28 that was built in 1938 for a Detroit resident and fitted with a Scripps V12 engine. It is one of only two such models still afloat today.

Following a full restoration, this classic runabout is expected to fetch up to $425,000 (£275,000) at the auction, which is taking place in Detroit’s neighbouring city, Plymouth.

Joining Sea Flow II is an even more historic motor boat. May LaFever was built in 1912 in Geneva, New York by Fay & Bowen Company, before spending her early years on the Adirondack lakes.

However, she was taken out of service in the late 1930s and remained in storage for 60 years. An extensive restoration has seen her return to the public eye, making award-winning appearances at countless classic boat shows around the US.

Boasting the original topsides and deck planks, this historic 26ft launch is valued at $160,000-$200,000.

More than 50 vintage and modern cars will be joining this brace of classic boats at the Motor City auction, which is due to take place on July 25 at The Inn at St John’s.