OK, over to you experts again! This stands a little short of 6 inches tall and 2.5 inches across. It has a T bar hand setting timer with a ring pull that would appear to allow for a trip wire or landyard to set the clockwork mechanism running. The graduations are luminous. The bottom part when removed reveals a detonator. The top is marked in ink stencil INERT T.84 and stamped 1 SLC 83 12. The logo on the lead seal is an anchor. I don't think its a naval alarm clock but other than that I haven't a clue - do you?
Oh, and a very merry christmas to you all, Dave
Oh, and a very merry christmas to you all, Dave