Chatwood - Kromer wallsafe/locker lock?

[chubbbramah]

This is a wallsafe/locker lock faintly marked ‘MADE IN SWITZERLAND’, with one original key stamped CHATWOOD, presumably bought in from Kromer. The lock provides for 3-point locking at top and bottom of the door, but this was not used — the original case plugs are still in place.
The lock was collected from the Manchester area in the 1970s by a now-dead collector, from a disused bank building.