The new Seiko 5 Sports Kosuke Kawamura Limited Editions SRPJ43 and SRPJ41 will become available in September/October A modern reinterpretation of the 1970s Seiko Time Sonar in collaboration with Kawamura with an amazing signed case back. SRPJ41 is limited to 3,000 pieces / SRPJ43 is limited to 500 pieces.