Sure it isn't a pattern weld? it's specified as a 6+6 layer suminagashi...
Some pattern welds are subtle until they patinize ... compare https://www.feinewerkzeuge.de/anryu.html ... got that one, you hardly see the pattern if freshly off a stone, but the patina intensifies it...
" Masakage doesn't have much the mystique of one old Japanese dude in a mountain village dedicating his life to knifemaking "
It does have the mystique of realistic but high class, traditional toolmaking for users, doesn't it? The whole "made in batches by passing along a handful of specialized artisans spread across town, in a way that still makes such methods practical today" narrative is sexy if you want good tools
Ah you're right the suminagashi right above the cladding line is VERY similar to your Anryu
Masakage knives are great tools, and I love my Shimo, but I have no idea who actually made my knife - most likely not Kurosaki himself, but apprentices who did most of the work. On my Toyama though, I know exactly who did everything from forge welding the Blue #2 to final easing and polishing. Not practical at all, but it DOES feel pretty special to hold someone's lifetime of effort in your hands