I've been doing several of these each year, usually when I'm needing to challenge myself for a week.
Called "Crushed W Feather Pattern", or, "Feather Damascus".
All fluxless forge welded in the blown ribbon burner propane forge, thanks J Emmerling for introducing me to fluxless forge welding!
These things are a pile of work, with many different steps in the process, but quite pretty upon completion.
Ebony handles, I started using .22cal rimfire cases for the rivets, like the look.