Subaqua model 18542 | InvictaWatch.com,Subaqua model 18544 | InvictaWatch.com,37844) Grand Seiko Credor Spring Drive Power Reserve 18k WG / Deployment | European Watch Company,Wearing a Credor GCAY999 (4S79-0020) today. The hand wind 4S caliber with power reserve and sub seconds is a nice movement that turned up on a small number of models. #credor #クレドール,Credor Spring Drive Sonnerie GBLQ998 18k RG | Auctions | Loupe This