Double Ball float that is completely sealed.  The inner ball measures 1 1/2 inches at its widest.  There's also a well-formed nubbin inside the inner ball.

This is a heavily used working float as evidenced by the many scuffs and scratches in the glass.

This float measures 6 inches in diameter.

Found in Northern Japan.

This float has excellent provenance having come from the ex-Ramon Fulton collection.