Underneath the screw-in caseback featuring Seiko’s tsunami logo, you’ll find the 6R35, Seiko’s mid-range workhorse that boasts a 70-hour power reserve. That’s a whopping 20-hour increase over the 8L35’s 50-hour power reserve. (Superfans of this movement should know that the 6R35 powers numerous watches across the entire SPB line, like the SPB143 and SPB153.) Seiko will make a total of 6,000 examples of the SPB207, and 3,000 of the SLA047, and both limited editions will be available in April, a fitting release to match the green hues of Spring.