Dark Cobalt Blue Seal button that's on a 3 1/4 inch float. This float has faint blue swirls throughout.
There is also a partial stamp that could be maker's mark WP #81 '2'.
Marked blue dot with blue swirls in an unusual 3 inch size (for blue dots) ... one-of-a-kind?
Beachcombed by Paul Umlauf on a Gulf of Alaska beach.