There are quite a few of the modified T-91 grenades showing up lately. Here are a couple of shots of the one I have that was not dug up. It shows the markings and the rice paper insert in the drilled out area where the propellant charge would have gone. I believe it tells that the delay has been changed to a 4 to 5 second delay. Does it say anymore then this? It is marked 14.1, which could be either the date it was made or the date it was modified. What do you think? Also pictured is the T-97 grenade from my “Mine Training Kit”. It has the same kind of tag on it. – Ken