Small 2 1/2 inch float with a cobalt blue seal button.  The blue seal is about 1 1/4 inches at its widest.  There appears to be some blue swirling in the seal, too.

The mark is WP #56, a roof trademark.  On this float, the 'roof' part of the mark is incomplete.

This float is blue/green in color and has many air bubbles in the glass.

This float has excellent provenance having come from the ex-Col. Rich Richardson collection.