The second table, measuring almost 5m (16.4ft)-long and made in 1935, sold for £36,000 to a bidder in Hawaii.
Hawleys said the sale prices had “burst through” the estimates, with the 1937 table having a guide price of £8,000 to £12,000, and the 1935 table at £5,000 to £8,000.
Each table had four benches, which sold to the same bidders for between £3,000 and £5,000.
Auctioneer Caroline Hawley said: “It was amazing. Both bids just went up and up.
“We have checked and £42,000 is the highest price paid at auction for a piece of Mouseman furniture. [It’s] really exciting.”