... In fact, it is not a public museum but a exposition at the equivalent of Woolwich in england: Bourges.
Thanks, Norman.
I'd be happy to accept that BMM adopted the Mills centrepiece, with threads in the grenade body to accommodate No.5-style base plug rather than their original base plug pattern. Just difficult to find the evidence.
As for the W&J George examples, I believe two samples were made, with multi-piece centre with separate brass detonator sleeve. Were more produced...?
Tom.