Unknown small brass container

[Depotman]

Can anyone identify this brass container. It has only one mark on it which is “1.5”. I've had a couple of these for years (from a 'military' source) and have never seen anything like them before. TIA - Depotman

 

[Hoeksel]

Not that it helps now, but to me it looks more like "I 5" iso "1.5".

 

[Depotman]

Not that it helps now, but to me it looks more like "I 5" iso "1.5".

Many thanks - I put a strong magnifying glass on and can confirm there is NO 'dot' and the number "1" is actually a Roman "I". The rough cast surface has the letter and number cast in, not machined in after casting.

 

[glevum]

Could it be a male and female threaded cover stowed together.

We commonly store lens caps and body caps for cameras together when the lens is attached to the camera.

 

[Depotman]

Could it be a male and female threaded cover stowed together.

We commonly store lens caps and body caps for cameras together when the lens is attached to the camera.

Thank-you - it certainly makes sense having two items that fit each other, but no room for any contents once the 'lid' is screwed in. Any other ideas?!

 

[millsbomber]

could thy be for testing threads internal and external

 

[Alan1]

Looks more like a container for a glass lens or similar, and part of a set of various thickness/power etc. That would explain the mysterious 15 on the lid.
Alan1.