I did notice that some L series levers at the bottom had a small hole at the end for a safety wire, i was told was there just incase a pin was accidentally pull and lever not secured, just as the modern Swiss grenade has with a safety clip which is removed before the pin or after, visa versa. The mills doesn't have this secondary feature and was used to compare. Not sure what the accident rate was with grenades where levers and pins were accidentally removed ie snagging etc.
I have seen the L series in blue practice with violet markings may be these mills are the same but not completely blue as the practice L series, the mills being short lived at the time and the markings adequate.
View attachment 165866Mills filler plug
View attachment 165872View attachment 165873
Here's some 1970/71 ex range base plugs and the one from my trials 36.
When came the change of color code (yellow band on body) ?