The Mk 111 Low Angle Gunnery marking camera.
( Mk 1V at Hist1416)

Three pictures of it in this post.

Ship/Place/Originator:
Date / Date Range: c1930s
Submitted By: Included with Hist101
Now Held By: Historian
Date Added: 20-12-2021
Historians Number: Hist1415
Original Website Link