WP #126 is one of the 'Sa' サ marks. This is Sa サ accompanied by a 'U in a circle'.
It's an uncommon mark.
This is a perfect stamp that shows all points.
The seal button has one chip and a single flea bite. The body of the float does have a manufacturing flaw that was resealed in the second firing process.
Lots of bubbles.
This float was found on Hokkaido Island, Japan.