This is a really old PC, but I don't have any clue about its era.
The construction is a simple assembly of metal sheet and rivets. The back door is missing.
The focussing mechanism is also based on a sliding plate holding the lamp.
When I bought this lantern, the lamp holder was a P28s, but I doubt it was the original lamp holder.
The locking knob is made with a thermal insulating material.
- Lamp: Episcope
- Lens: Clear PC 110mm