Oooh ... a Henry sealing rifle !?

I've not seen one yet, and as Donald said in the book :

these sealing rifles accounted for around one fifth of the entire output of Henry hammer falling block production, amounting to 2522 in total.

and yet ...

"What is remarkable is that out of these hundreds of sealing rifles, hardly any survive today due to their hard usage in inhospitable conditions and their constant exposure to salt water. Each rifle also fired thousands and thousands of rounds every sealing season and I am sure cleaning the rifles was not top of the agenda on a trip to the Arctic. "