Haggadah from 1726 found in a garage in Britain. Photo: Screen shot.

An 18th-century Haggadah found by chance in a Manchester garage is promising to offer a huge payday for its owner, the Daily Mail reported on Tuesday.

Created for the Oppenheimer banking dynasty in 1726, the auction house handling the sale says it could fetch up to £500,000, or $805,000.

According to the Daily Mail, the Haggadah made its way to Britain when its owners fled  Nazi Germany. The Passover prayer book was only discovered recently, however, by the now-deceased owner’s niece who was planning to sell some of her aunt’s belongings.

“Auctioneer Bill Forrest was completing a routine valuation at the Bury home and found it tucked inside a kosher soup carton, The Independent reported. An expert in Amsterdam then concluded that the manuscript was the work of Aaron Wolff Herlingen, a scribe to the Imperial Court in Vienna in the mid-18th century,” the Daily Mail wrote.

Watch a video about the discovery of the Haggadah below: