A Halifax was built by Darne. At the time this gun was built, there were so many other manufacturers building copies of sliding breech guns that they put that stamp on the Halifax to assure customers it was an actual Darne product, as opposed to a copy.
Originally, the gun had 65mm chambers, about 2 1/2". It was proofed in St. Etienne for smokeless powder T, and the gun was proofed in a finished state. It is a 12 gauge. At one time there were grade 3, 4 and 5 Halifax guns, mid 1930s, and that is about when this gun was produced. It appears to be single proofed, most lower grades were.
A few more pictures wouldn't hurt a thing.
Best,
Ted
