I found the following unit marked P08's recently.
1908 Military first issue, sn 1597 nonrelieved sear and no holdopen.
B.8.R.M.G.81. The numerals were all 2/3 the size of the letters. All letters block.
1916 DWM sn 3715 l. Grip strap 139.R.6.C. numerals and letters equal size. Very small, they were no larger than the weapon number within most unit marks.
Geo
1908 Military first issue, sn 1597 nonrelieved sear and no holdopen.
B.8.R.M.G.81. The numerals were all 2/3 the size of the letters. All letters block.
1916 DWM sn 3715 l. Grip strap 139.R.6.C. numerals and letters equal size. Very small, they were no larger than the weapon number within most unit marks.
Geo