Inside is
link Seiko's "slimline" caliber 6L35, a thin automatic movement with a 45-hour power reserve. It is basically Seiko's competitor to the ETA 2892, with similar performance and measurement specs. Seiko
link introduced the 6L series of calibers in 2018 as an upgrade over its R series calibers. Even with the new movement, Seiko says the accuracy is just +15/-10 seconds per day. The first KSK had a 6R movement but
link was priced at $1,700.