Mark WP #63-A is 'Da' 田 under a roof. It's classified as a rare maker's mark.
WP #63-A is usually only found on 3 1/2 inch floats. This float measures 5 inches in diameter.
It may be the only known example of a WP #63-A stamped on a 5 inch float known to exist in a collection.
Found on Hokkaido Island, Japan.