At 11" long its inbetween a marking gauge and a panel gauge. But generally too long to be considered marking.
Almost has to be,.. most commonly said.............
1 user made if you don't like it much, (especially if you specialize in collecting factory tools exclusively)
2 craftsman made if you like it but not a lot,
3 bench made if you like it better than that,
4 custom hand made if you really like it,
5 museum grade if it knocks your socks off.
Humans are odd. They make up different words for the same thing, to tell you how they personally feel about something.
These get mixed around a lot from the order of my list, but as a toolmaker, I hear all different things.
Besides ebony there is African blackwood? The guy could have had something to with woodwind instruments which always specified blackwood.
Its sort of lightweight as far as thickness and no metal wear strips, so it wasn't worked hard year in and year out, whatever it was made for.
With time, many other woods turn black. Cocobolo will turn black and some rosewoods will too, ironwood (of which there are a zillion kinds), etc, etc.
I have a western black oak towel rack I can see from here. It is now pitch black in only a dozen years just hanging there.
Funny, the towel bar, turned from the same stuff is still light, but the frame could be ebony from 6 feet away.
just ruminatin' on a Sunday
yours Scott