What a find! I remodeled a kitchen in the Wedgwood area of Seattle, and when I started taking the old cabinets apart the first piece split from one end to the other, and I knew it wasn't plywood. They were solid fir boards, up to 21" wide. Destined to become a nice art box. I'm still getting up the nerve to go at the dovetails.

Just out of the wild, before its first its first shave.
The board, on the operating table.
Grain close-up.
A close shave.
Gasp! A Stanley #60 block plane (English). With a Hock blade in it. I am eye-balling a Veritas Smoothing Plane. . .