While clearing the cellar at our old Haveli we discovered this

Full frontal view

Full back view

Stock assembly

Barrel and oroginal sling

Foresight on the Barrel

Hammer and firing chamber - the little white dot on the right is the place where the hammer will strike

It was neatly packed in a wax coated cloth with a cushion of wheat husk packed in second layer with cloth strips, except for some rust at few places it seems to be in good condition forcing me to think the foresight my great grandfater had when he kept it. My grandfather remember seeing this only twice (he was born in 1920 and often reffered to this gun as owned by his grandfather during the 1857 war of independence, He himself has served the British Army and fought the second world war in Japan and than the first war with Pakistan).
Next on my task is to restore it to its full glory

Please suggest:
- How and where should I start
- so that it is restored with minimal damages.
Regards
Gopal