I have since found reference pictures in the forum, so definitely a Saotome. I suppose any particular deviations could be due to which particular individual made this paticular suji?
Given it's present state I would venture it's a good candidate for restoration, yes? As there are so numerous variations possible to apply in all the years suji were made, given the holes along the perimeter, what combination of those accoutrements does this suggest were likely used?