Has a restorer of antique weapons I have never come across this type of restoration .The trouble with a large majority of antiques restoration is taken to far a gun which is almost 200 years old should look 200 years old not something almost new straight off the shelf. one of the main mistakes is the checkering nothing looks and feels worse than crisp checkering on an old gun.
Feltwad
I had a fine Whitworth Semi Military match rifle that had fine,crisp checkering and after 11 years of me using it the checkering was still crisp.It was made in 1860.
One of my interests for many years are major classic cars of the 1930's and I see these at shows from time to time that look like they have been porcelainized instead of painted.
Over restored ANYTHING is bad IMHO.PRESERVATION is the way to go.
Bob Roller