It also pays to read the entire explanation...
The lanyard loop magazine was primarily for Cavalry - 'they' could fight from horseback and could lose things in a hurry.
Infantry didn't issue as many M1911s - Machinegunners, Non-Coms and Officers were issued them since their jobs were different.
At 'that' time - the lanyard was affixed to the lanyard loop on the mainspring housing - in order to retain the piece should it be dislodged from the hand - a frequent occurrence when subjected to shellfire.
By the Great War, the lanyard loop was done away with on new-production magazines, but many originals remained in service, and were a staple of Cavalry life until 1941.
Interestingly enough - there was also a short-lived 'Cavalry' hammer featuring a longer spur with slightly wider 'ears'.
Vaya,
Scouts Out!