Congratulation on the Hussey. Hussey sold his own guns. I once owned a Hussey Imperial, made around 1915. I sold it to a friend who later acquired the mate to put the pair back together.
They are wonderful guns and have tried to buy my Hussey back from my friend who will not part with it.
As far as I know records do not exist. In fact it is hard to date these guns.
In the book Atkin Grant & Lang there is a section on Hussey guns.
Cheers!

Mike Proctor