This undocumented mark has three distinct parts that make up the entire mark.

The lower middle part has mark WP #130, which is the 'Sa' サ in a triangular configuration.

On the upper left part of the mark has the symbol 'Sei' 製, which means made or manufactured.

On the upper right has the 'Tokui' 特 symbol, which means special.

It's a perfect stamp of this mark.

This is a light green 4 inch float with a nice net.

There's also some tar remnants.

Found on Hokkaido Island, Japan.