Click pic to change from a 20mm to a 155 shell.
It's a bloody cigarette lighter.
Security took this away from me when we boarded the ship after visiting Tsarina Katrina's Summer Palace outside St. Petersburg, Russia. They gave it back when we disembarked in England.
And just a note: If I'da known I'd get hassle over this, I woulda bought the old grenade too. Heh ...