If they can document that, like if they still have the plating receipt that makes it a 1 of a kind , making it the most collectible of the Singer 1911's.
Found these
https://www.popularmechanics.com/military/weapons/a23340620/singer-sewing-machine-company-45-pistol-gun/This from Wiki
During World War II, the company suspended sewing machine production to take on government contracts for weapons manufacturing. Factories in the United States supplied the American forces with Norden bomb sights and M1 Carbine rifle receivers, while factories in Germany provided their armed forces with weapons.[15]
In 1939, the company was given a production study by the government to draw plans and develop standard raw material sizes for building M1911A1 pistols. The following April 17, Singer was given an educational order of 500 units with serial numbers S800001 – S800500. The educational order was a program set up by the Ordnance Board in the U.S. to teach companies without gun-making experience to manufacture weapons.
After the 500 units were delivered to the U.S. government, the management decided to produce artillery and bomb sights. The pistol tooling and manufacturing machines were transferred to Remington Rand whilst some went to the Ithaca Gun Company. Approximately 1.75 million 1911A1 pistols were produced during World War II, making original Singer pistols relatively rare and collectable. [16]