Seiko Instruments Inc. PC33A

The PC33A is a quartz movement manufactured by Seiko Instruments Inc. in Japan. It has a 23.7mm diameter, uses a SW626SW battery providing around three years of operation, and maintains accuracy within 30 seconds per month. The movement adds a day complication to the base PC32 caliber and features a detent button mechanism for crown and stem removal. It remains in production as part of the standard movement line.