This is a film splicer from BBC Pebble Mill, which would have been used in Telecine, for cutting and joining lengths of 16mm film. The same machines were used in the film edit suites. The splicer could cut film straight, or at an angle, and also held a roll of sellotape for joining the pieces of film together.
Each splicer was obviously labelled with the building name, and a number, to stop it wandering around the building, and being taken off by someone else in error.
Thanks to Jim Gregory for keeping it safe for many years.
The following comment was left on the Pebble Mill Facebook page:
Nigel Mercer: ‘The lever at the bottom was for cutting the mag sound diagonally and the one next to it was to straight cut between the film frames on the frame line. Amazed I can still remember !!!’