grip varnish question

[kenny s]

I have a Colt Navy antique that have grips that I have to replace.
no worries, the old ones are non factory and I want walnut as per the original London Colts.

When I finish, I want to 'age' them. and then stain them as close to the original 'red' Colt used.
any ideas.

I know that Colt used melted Amber in the mix. A violin finish.
too expensive for me,

thanks..Ken