Pal Blade and Tool Company, Holyoke, MA (PAL).Union Fork and Hoe Company, Columbus, OH (UFH).Wilde Drop Forge and Tool Company, Kansas City, MO (WT).
These bayonets were made by contract suppliers on this list (the letters in parentheses are how the bayonets from this supplier were marked): It is sometimes called the M-1942 model by collectors, but that is not official nomenclature.
The second model M-1905 was manufactured during World War II, in 1942-1943. The metal parts of the bayonet were unfinished until about 1917, after which they were parkerized. The grips were made of wood inset to the metal of the handle. Each bayonet had its own unique serial number (range 1 to 1,196,000). The blade was 16" in length and the bayonet was 20" overall. Technically this was called the "Model of 1905" since the M numbering system did not begin until the mid-1920s. The first model of the M-1905 bayonet was manufactured between 19 by the Rock Island and Springfield Arsenals (marked SA or RI with the Ordnance Department symbol, along with year and serial number). M-1905 Bayonet for M-1903 Springfield Rifle. The M-1905 bayonet was the standard bayonet from 1905 through World War II and beyond, even though new, shorter bayonets were issued in the 1940s, such as the M-1 ten inch blade for the M-1 Garand. When the M-1 Garand rifle became the standard service rifle, this bayonet was still used. The bayonet for the M-1903 Springfield rifle was originally a rod bayonet, replaced in 1905 with the M-1905 bayonet.