After many hours of research, while "Hizen" fits in written description, doesn't fit well with Hizen examples I'm seeing, I didn't include any specifics so here's a better idea
Shape; Mokko / with slight goshi-gata "convex cross section" 4.5mm thick
Kaku mimi koniku "square rim with slight rounding" 3mm thick at square edge
Generic kozuka / kogai hitsu-ana both 1.85 L X 1.05cm W
Inlay; is Hira-zogan , cross hatching around waves say nunome but not for sure if that's accurate as of right now
Theme; from a study on dragon mythology,
quote; "Then are pictured celestial dragons ascending and descending through the upper air, tearing a path, perhaps, through swirling mists and shadows, "in pursuit of effulgent jewels or orbs that appear to be whirling in space"
first impressions, the silver dots were to accentuate the Nami or "waves" but could also be tema or pearls, jems, orbs? IDK
I still have many questions, in regards the "style" or form of the waves, I'm finding nothing similar, has anyone seen similar work in shape/ form or style before ? If so does it got a "name" or classification I'm curious
And
Am I on a "snipe" hunt based on estimated time period 1700-1800's, odds of narrowing school or provence down above 25%?
If is " hizen" got a similar example you could show me, I did find a couple examples from one school that hit on many points
"kinko" school, so possibly one of the subdivisions? Is my guess here's a couple ko-kinko that had similar points
first pic, waves similar in form with silver dots, tagane around nakago
second is a dragon very close in style among a few other similarities
thanks in advance