Where on a Lancaster ?

Thanks very much. I’ve had it and a few other parts that I picked up from a Lancaster crash site a few years ago and often wondered what it was.

It’s part of the sighting head from a Mk. XIV, XIVA, or T.1, 1A bomb sight.

See the attached photo.

It locks the head when not in use.

It might be from a Lancaster, but could be from just about any other British bomber from 1943 onwards.