Others are can be located when offered for sale by antique tool and used book dealers or on online auction sites.
Copies regularly turn up at old tool swap meets and in estates of tool collectors.
I found no reference or illustrations there about their use on back saws.
Given that the brass back is marked simply Disston and that this logo predates the use of the Disston and Son logo introduced in about 1865, I believe we can safely date this saw as being from the Civil War era of 1860 - 1865.
works where the copyright has expired, often because its first publication occurred prior to January 1, 1923. This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland.
An early and rare example of a finely made backsaw!!
Although the brass back is marked Orton Jewett & Busby, I do not think they were the maker, just the seller or distributer.
They had their line of tools made for them by the big makers like Disston & Stanley. Simmons did not make tools or saws they marketed them, and were masters at it.
They had their line of tools made for them by the big makers like Disston, Atkins, Stanley or others.