saw Yeoman's write up on the SSA003K:
4R37 Seiko Superior – SSA003K « Yeoman's Watch Review
but checking the owner's manual, it reads:
"Cal. 4R35, 4R36, 4R37, 4R38 & 4R39"
and we've seen the seikos 5s with 4R36 movement as well... the 35, i am assuming would be similar to the 36, but without day... the 37, with 24H counter... but what about the 38 and 39?!?
any variants / models using this movement already?