Lock finishes by Henry, Rigby, Purdey, etc.?

[Naphtali]

I notice that Shiloh Sharps Rifle Company offers three lock-action finishes for their 1863 cap lock rifles and their 1874s. Pedersoli offers a chemical color case and some sort of polished silver finish on their Kodiak double rifles' locks.

What finishes were regularly used by British gunmakers, such as Alexander Henry, Purdey, Rigby, etc., with bar action percussion sidelocks - when the locks were used for Express rifles and African or Indian game hunting, circa 1850-1875?

Were lock plate's exterior finish some sort of case or pack hardening, would that finish also have been applied to interior lock parts? To hammer? Other?

[FlintFan]

Internally, polished mirror bright.  Externally, including hammer, bone/wood charcoal color cased hardened.  

[westbj2]

The norm is color hardening externally, and polished internally.  However you will frequently find color hardened bridals.
Below is a lock by Stanton on a Thomas Turner match rifle.  Below that is a Brazier lock from another match rifle, on this lock the colors were not polished off internally.
Jim Westberg

[Bob Roller]

These styles of locks are a lot of fun to try to copy and will test
your ability with machines and small files.I have orders for 2 of the Stanton
style and must make a bridle drill pattern for the Brazier which is a more
difficult pattern.

Bob Roller

[Dphariss]

Love those good to best quality English locks

Dan