This is the tiniest marked float I've ever seen.
It's only 5 3/4 inches in circumference and 1 3/4 inches in diameter.
It's stamped with WP #173 'Betsu' but not all of the stamp fit on the seal button (i.e. it's missing one of the vertical lines).
WP #173 is a common mark and tiny floats are fairly unusual but finding the combination of a marked tiny float is exceptional.
If you love tiny floats, this float is an absolute gem!
This float has excellent provenance having come from the ex-Ramon Fulton collection.