Ya know Tom,
I'm glade you posted this.
I happen to have a #23, which I bought used, and it has a little more wear on it than I like.
You might be able to see in the photo that the previous owner(s) might have thrown the bevel out of wack
while sharpening. And there are some stains/spots that Flitz won't remove. So maybe it's time for this knife
to make a trip back to the shop for some tender loving care. Looks like it's done wonders for your #23!