What is this?

[Type4]

I have this but i not known if is a part of artillery or other weapon

[Rescue190]

Interesting item. I could not find anything comparable when searching. Someone will recognize the container.
John

[Kohima]

I would say you are on the right line, T-4, suggesting it was from an artillery piece.

The loop to the front of the canister would be for a leather equipment strap to pass through, securing it to the gun shield or trail.

The blue-grey paint colour and use of brass may, possibly, point toward a naval gun.

All the best,
Bob

[Geoff Ward]

Perhaps a component that went into a breech to protect the internals?? Just a guess.. brass being softer than steel would protect better??

Interesting item!, Geoff

[Long Shot]

I've seen several of these and the "explanation" is that these were associated with Artillery cannons and contained grease. Note really proven but not disproven yet either