This is an exceedingly rare vintage men's watch from the 1970s, known as the Citizen Automatic 4-820011K. It was originally designed for the Japanese Domestic Market (JDM) and is highly sought after by collectors. The watch boasts a striking design with a an emerald green sunburst dial, silver stick hands, and indices. It comes with a stainless-steel bracelet and features a signed crown.
A noteworthy feature is the convenient calendar quickset function. You can adjust the day by repeatedly pushing the crown when the 12 o'clock position is at the bottom, and it's available in both Japanese and English. Similarly, you can quickset the date by repeating this process when the 12 o'clock position is at the top.
The quickset function is dependent on the watch's vertical position, thanks to a mechanism that transfers the stem's motion to either the date or day disk. In terms of dimensions, the case measures 40mm (excluding the crown) by 42mm (lug-to-lug), with an 18mm lug width and a thickness of 14mm. This watch is a true collector's gem due to its rarity and unique features, making it a prized addition to any vintage watch collection.
