I was recently browsing through Ebay's antique sword listings and I came across two different sabres, one a swiss 1869 cavalry sabre, and the other a Japanese WWII military sabre. Each of them had something I'd never seen before: a leather finger loop inside the guard. I'm guessing it was for better handling rather then protection. Was this common among sabres? When was the finger loop first used? I have seen many antique sabres and own a few and I don't recall ever seeing this before.
Some pics below. Hopefully they show.










The Japanese sabre.