Gun case for transport.

[David R]

I am not entirely sure if this is the right forum to post on, but it looks the best bet. A recent purchase from Flea Bay, a late 19th early 20th century, hard leather, lockable case for a "take down" shotgun or rifle. No gun, but an evocative accessory for such.

[Bob A]

These used to be called "leg of mutton" cases.

[David R]

The exact term used by the vendor.