This float is quite unusual because it has two different maker's mark. One mark on the top seal and one mark on the bottom of the float.
The mark in the picture is WP #7-A and the 'Se' セ symbol is a 'tiny mark' measuring a mere 1/4 inch across.
The mark on the seal is full-sized and it's WP #321, commonly referred to as 'C1' or 'G1'.
This bi-mold float is 3 1/4 inches wide.
This float has excellent provenance having come from the ex-Col. Rich Richardson collection.