Working/Operational SEIKO SilverWave Seiko Silver Wave Ladies' Wristwatch Antique Vintage ● Model Number: 3421-0030 ● Wrist Size: Approximately 17cm (no extra links, aftermarket) ● Case: Approximately 3.0cm x 2.1cm (excluding the crown) ● Manufacturing Date: December 1979 (estimated from the engraving on the back cover) ● Battery: Currently working, the replacement time and remaining charge are unknown. ● Crown: Operational Time can be adjusted 【Reference】 https://rich-watch.info/1169/ https://ameblo.jp/maronakki/entry-11216003924.html ※ As this is a used item, there may be some undiscovered defects.