searching can be tricky. I believe it was from some time ago, though I couldn't point you to an exact date.

I did include it in a summary of traditional finishes, which you can access by clicking on the link here and requesting access.

Ken61's finish is on page 13.

There are also several shellac finishes from early (c1940s) American gunsmiths, such as Howe and Newell, which you'll find in the second half of the document