Marked 18 inch float that measures a full 56 inches in circumference.  This float is in perfect condition - no chips, not even a flea bite.

There's a clear and complete stamp of WP #6 'Maru Sen' 仙 commonly known as 'TY' on the ID seal.

There's also a second patch.  This is not marked like an ID seal, so that leads me to believe it could some kind of repair patch (especially considering the location right next to the seal button).