I am posting this for a friend who is interested if any of the antique guys (no, not your age!) have observed this pattern on a buttstock bottom flat, or any other area of a rifle stock for that matter. On page 103 of the new book, Pennsylvania Longrifles of Note 4th Edition, a very similar pattern is present on the bottom buttstock flat of a Thomas Allison rifle.
To me, it looks like a lot of tedious work, but it is eye catching.
Thanks in advance for your help, comments, or observations.