The finish is 3 coats of Cellulose sanding sealer ( thinned about 50:50) rubbed down between each with oooo wire wool, then Woodwax 22 applied with w/wool and buffed.
It's made from a 9" L x 7"w x 4" thk plank - left oblong, that's about 12" on the diagonal.
Chris
....just be careful of your fingers !