If you are a LCSCA member Roger you can email Dr. Jim jstubbendieck@gmail.com
Unfortunately, at that DOM the information in the shipping records is limited, and is about when Crown Steel barrels were first introduced for the No. 3.
And that early the Hunter Arms Crown trademark may not be on the barrels
Sanderson Bros. likely imported Crown steel barrels for the Pigeon Gun introduced in 1893. Crown was offered for the A-2 and A-1 in 1894, the No. 3 about 1895, and the No. 2 in 1898.
Nitro steel was introduced in 1897 for the A-2, A-1, No. 3 and Pigeon and later the No. 4 and No. 5.