Old Copper Coach or Post Horn in Two Pieces

This long horn is made of copper.

There are two brass collars along its length - the horn has come apart at one of these joints.
The horn is not stamped or engraved
The horn has an original mouthpiece.

Dimensions 44" (113cm) length when together

Diameter of mouthpiece 1" (2.5cm)

Diameter of copper tube at join :⅝" ( 1.5cm) 

Ref: Two piece horn