WW1 Trench Art Mills Bomb/Grenade Lighter

An un-cleaned, left as found WW1 Mills bomb casing that has been converted into a trench art lighter, the casing bears the foundry mark of McD.S which I believe to be McDowall,Stevens Ltd of Falkirk, Scotland (1828-1930).
The plug hole at the base of the grenade is still threaded but this thread is hardly used to secure the grenade to the wooden base plate, you simply lower the grenade onto the steel cylindrical plug and slightly turn the bolt underneath until it catches, left loose for now, the small striking wheel still rotates and sparks.
Unable to find any online images of McDowall, Stevens produced grenades so possibly a rare casting.
Please see additional images.
Sorry Mainland UK sale only, must be over 18 yrs of age, photo I.D will be required.

Code: 51047