Inert, WWII British No.36M Mk.I Mills Hand Grenade.
The grenade body has a cast marking of "G&M L" for Glover & Mail Ltd.
The base plug is worn, but the maker’s initials are “H & TV LD” for H & T Vaugham Ltd.
Note - the threads on the base plug are worn, so it doesn’t screw all the way in.
Please see the photos.
As always, thanks to the Mills Grenade Collectors website for the information on manufacturers.
Tracked international shipping at cost and at buyer's risk.