I may have more info on your guns in another reference.

My current references say curious things like the following:

Some of the Lang & Hussey guns had the name removed and were re serial numbered.

- if it were a Lang it would be between 1905 @ 13789 and 1910 starting at 14815.

In 1919 Harrison & Hussey started with serial 1000 and in 1929 at 3466. It then says in 1930 the numbers merged with Grant & Lang at 17000.