Mike,
I have all the M.H. Cole books and the "Best Of" re-edited by Mike Silvey
Here is what I found in Cole's book #3, hope it helps.
Jim
BAYONET MODEL 1905
The M. 1905 bayonet has a 16" blade and walnut handles. It fits the M-1903 Springfield and M1
garand rifles. These bayonets will be found dated 1906 through 1922. the early dates from 1906 up to 1917 had a bright polished blade. With the hilt and guard and about 3/16" of the blade blued. Starting with the 1917 date all of the metal was parkerized through the 1922 date. On occasion some of the early dates will be found with a blue or parkerized finish. These are thought to have been arsenal refinished. Stamped on the reverse S.A./bomb/and date on the obverse is stamped U.S. over a serial number. This same bayonet was made at Rock Island Arsenal and stamped R.I.A./over bomb/& date.
It shows sketches also of the scabbards.
Type #1 had a short metal throat on leather body stamped R.I.A./1906 J.N.S.
Type #2 had a long metal throat on leather body stamped R.I.A. /1907 H.E.K.
Model 1905 modified Scabbard stamped R.I.A./1907 F.P.B.
Model 1910 Scabbard marked B
oyT it had a canvas body with a leather tip.
Model 1910 Scabbard type No. 2 scabbard shows a deeper throat into the canvas body.
BAYONET MODEL 1942
Bayonet model 1942 was essentially the same bayonet as the M-1905. The main difference being a change from wooden to plastic grips which were usually black. But some are redish brown color. These bayonets were not made at the U.S. arsenals but by different contractors and were certainly not as well made and finished as the previous arsenal made bayonets. They were stamped with the makers name or mark, over an ordnace bomb, U.S. over the date of manufacture such as 1942-1943. The M3 scabbard made of olive green plastic was issued with bayonet.
Sketches show different makers markings, OL, U.F.H., PAL, WT, AFH, UC.
Later it talks about the:
Bayonet M.1905E1 which were modified 1905 & 1942 bayonets.
In late 1942 it was decided to cut 6" from the existing bayonets thus making a 10" blade. Some were ground to a Spear point and some to a Bowie type point