Quote:
	
	
		| 
					Originally Posted by Jim McDougall
					
				 ... So the question is:When was the broad arrow first implemented as a marking on arms? ...
 | 
	
 Yes Jim; that is the original question indeed 

. Udo is coming close, so it appears 

.
As for this mark having been used since early times as a symbol of the King's property, the most bizarre things are found with such mark; meaning that, finding it in plausible property like canteens, is nothing comparing to bizarre items like screws 
 
 
.
.