The Seiko Instruments caliber PC21J is a no jewels quartz movement found in many entry level timepieces. Although these movements are marked “ Japan ”, they are assembled in Japan and not entirely made in Japan.

MOVEMENT SPECIFICATIONS CAL.PC21J 6 3/4 X 8 Ligne Quartz Movement Three Hands 1. MOVEMENT DIMENSIONS · Outside diameter ψ18.20mm (12H~6H) x 14.11mm (3H~9H), ψ18.50mm · Casing diameter ψ17.80mm (12H~6H) , ψ18.10mm · Total height 3.15 mm (including the battery) 2. TIME STANDARD · Type of quartz oscillator Tuning fork

PC21 SII Quartz Watch Movement is a 3 hand movement (hour/minute/seconds). This ladies movement is a 6 3/4 x 8 ligne movement, dimensions are 15.30 mm x 17.80 mm with a thickness of 3.15 mm, overall movement height is 4.85 mm. Hand dimensions are 120/70/17 (h/m/s). 0 jewel movement, uses 377 battery.

精工仪器有限公司（SII）在长达80年的可靠精密计时器设计、开发和制造的基础上，在广泛的领域开展业务。 在当今充满活力的商业环境中，包括物联网、人工智能、机器人技术和共享经济在内的第四次工业革命已经显著改变了社会和工业结构。

SII Crystal Technology offers quartz crystals that meet the needs of society, taking advantage of the small size, high precision, and high reliability technologies cultivated over many years through the development and manufacture of quartz crystals for quartz watches.

Seiko Instruments caliber PC21S is a 0 jewels quartz movement found in many ultra-entry level timepieces. This 3-hander caliber is a true no-date movement. Note: This caliber number is often misread as “PC215”.

Manufacturer Seiko Instruments Inc (SII), TMI (Time Module) Caliber Number NH36A (aka NH36) Movement Type Automatic, self-winding mechanical Lignes 12”’...

SII. 日本精工从做手表起家，围绕手表及其周边延展，秉承着对产品【匠、小、省】的追求，将产品推向世界各地。我司代理的是精工集团旗下的Quartz Crystal和CMOS IC。 进入官网

Cost-efficient, slim, lightweight, small, quiet, and highly functional components are making significant contributions to developments in the electronics industry. SII produces a wide range of production equipment, including analytic and measurement devices, factory automation equipment, and functional products for industry.

MOVEMENT SPECIFICATIONS CAL.PC21J 6 3/4 X 8 Ligne Quartz Movement Three Hands 1. MOVEMENT DIMENSIONS · Outside diameter ψ18.20mm (12H~6H) x 14.11mm (3H~9H), ψ18.50mm · Casing diameter ψ17.80mm (12H~6H) , ψ18.10mm · Total height 3.15 mm (including the battery) 2. TIME STANDARD · Type of quartz oscillator Tuning fork