Not being an antique book or document expert, I cannot say as to value.
"Value" to history or reenacitng would also depend upon what info is shared. I suspect not much other than the "usual" testamonials and claims. (NOT that that is bad in any way for they are all fascinating.)
It was not unusual for the Period gunmakers to solicit favorable testamonials (often in exchange for free samples first.. ). I have a reprint of one for the Colt Navy apparently done for the English market as some of the testamonials came from Crimean War officers...
They also had "drummers" or traveling salesmen who went around demonstrating their products hoping to get them sold or noticed with an eye for government contracts outside of the arms trial submissions.
Dr. Edward Maynard of tape primer mechanism fame, had, IIRC four patents for a carbine beginning in 1851 (1856, and two in 1859). While the primer mechanism seemed such a good idea in 1855, but 1860 it had fallen from favor.
In 1857 Maynard sold 400 of the early type to the government for tests at West Point. Over the next two years, it did well in Army and Navy tests with the exception that thez .50 version kicked too much. In the 1860 tests it finished second behind the Smith carbine. But with the rejection of the tape primer, he was out of luck.. although the Confederates liked for some reason perhaps from having a number in Southern arsenals.
Seeing the writing on the wall in 1859 Maynard redisgned the .50 version, eliminating the "patchbox," tang sight, and the tape primer mechanism replacing it with a percussion cap cone.
But it was not until June of 1863 that Massachusetts Aams was able to get a contract for 20,000 of the second model. However, it took a year to set up, and the first batch of 1,040 were delivered in June of 1864. The last batch of 962 arrived in May of 1865. Along with over two million Maynard cartridges.
Because of the late deliveries, while some were issued, many remained unissued and can be found today in minty condition or surplus excellent or good.
Being interested in those kind of things, I would love to read the "pamphlet."
In gleichem Schritt und Tritt, Curt Schmidt
Not a real Civil War reenactor, I only portray one on boards and fora.
I do not portray a Civil War soldier, I merely interpret one.