Help identifying this ring

Hi,
I have a number of interesting objects from various family members who fought in WW2, but this ring is worn to the point I can’t tell what it is. It was my great uncle’s who was a mechanic , any ideas?

He also gave my grandfather a grenade with the pin still in it when he arrived back home and I now have it… pin still in.

Hi

Welcome to the Forum.

The ring appears to have the remains of a Royal (or Royal Canadian) Ordnance Corps badge on it.

Also, if you have a live grenade from WW2, you may want to think about properly disposing of it. I would suggest your local Police Bomb Squad.

regards
Darrell