New to me today, an Alex Henry sidelock in .303 British made in 1897 for the 7th Duke of Atholl.

Right side 26" barrels.

Left side plate of foliate engraving and gold cocking indicators.

Right side plate showing Celtic "chain" border engravings.

A better pic of the CCH

Bottom:

Top rib and makers name:

Cheek piece:

File cut top rib;