This is an automatic wristwatch from the 1960s, a Citizen Jet Auto Dater (21 jewels). It is known as the second-generation automatic watch from Citizen. It features an outer-rotor ball bearing rotor called the "Jet Rotor," and is characterized by the vibration felt on the wrist and the sound of the rotor spinning. The dial has the words "Auto Dater," "Citizen Jet," and "21 Jewels." It has a date display function. The case size is approximately 38mm without the crown. The strap is a free belt from Bear. It will be wrapped in bubble wrap, placed in a dedicated box, and shipped via Mercari delivery. Price reduced from 29,800 yen. ELGIN Elgin SEIKO ALBA ORIENT CITIZEN Vintage Watch Rare Watch Setagaya Base Seiko Orient Citizen Alba Orient Seiko Citizen ORIENT Seiko Type 2 SEIKO CITIZEN Seiko King Quartz Watch SEIKO 5ACTUS Vintage Seiko Watch Vintage Citizen Watch SEIKO KING Quartz Watch King Seiko SEIKO Type 2 SEIKO Five Actus Seiko 5 Actus All-gold Orient Watch CITIZEN DELUXE Vintage Watch 1970s Vintage Orient 3 Star Watch 21 Jewels All-gold Watch CITIZEN Jet Auto Dater Para Water CITIZEN JET Bear