This maker's mark is similar to WP #180 in many respects. It appears to be a roof mark with a line above the roof, so it looks like a 'K'.
It also differs from WP #180 because it's stamped on a 3-piece Korean float (i.e. not a 2 1/2" size float Japanese float). It's stamped on the seal.
This float was found by Paul Umlauf on a remote Aleutian beach in Alaska.