Core is a line of watches from Seiko.

• SDGM - Automatic, Cal. 6R15
• SGF - Quartz, Cal. 7N43
• SKA - Kinetic, Cal. 5M82
• SNAA - Quartz chronograph, Cal. 7T62
• SNE - Solar, Cal. V157
• SNN - Quartz chronograph, Cal. 7T94
• SNQ - Quartz perpetual calendar, Cal. 6A32
• SRK - Quartz, Cal. 6G28
• SRN - Kinetic power reserve, Cal. 5M84
• SRP - Automatic, Cal. 4R35
• SRPA - Automatic, Cal. 4R35
• SSC - Solar, Cal. V175
• SSC - Solar chronograph, Cal. V176
• SUN - Kinetic, Cal. 5M85
• SUP - Solar, Cal. V115