In 1989 I served as tank technical officer the mandatory one year in the Czechoslovakia army. On vehicle park guard duty I noticed a key ring on one of the many sets of keys hanging in the locker, so I swapped that ring for another ring.
That ring I used ever since - my first CZ250, CB750F, my CJ7 Jeep in USA, Dorothy and now The Red.
The other set is 900 - it came with the red tag from MoMo so I kept it on.