This is Citizen's "Cosmotron" electromagnetic balance wheel wristwatch. It was a popular model as an electronically controlled mechanical watch before the advent of quartz watches. Retro watch from the Showa era CITIZEN Citizen Cosmotron Special SP This watch has a strong presence. The dial shows some discoloration, which gives it a good look. The dial is a high-quality dial with fine lines. You can see structural colors depending on how the light hits it, but I couldn't capture it well in photos. Features: The Cosmotron does not consume battery power if you pull out the crown. It's suitable for everyday use, and also convenient for quick use when needed. No need to wind the mainspring. Equipped with the highest speed vibration, the only high-end mechanical movement 3600 high-beat 10 vibrations in the history of electromagnetic balance wheel products. Caliber Cal.7803 is equipped with a fine adjustment device and a time signal adjustment device. Green grid gradation dial Sturdy one-piece solid case Easy battery replacement with a one-touch hatch, making maintenance simple. The windshield glass is cut glass. It has been polished with cerium oxide, so there is no cloudiness, but there are scratches. The battery has been replaced with a new SR44. Both the indexes and hands are in beautiful condition. The belt is an aftermarket product, but it is a finely crafted 11-link belt. The free-adjust belt is nostalgic and innovative at the same time. Hands can be moved. Date quick-set OK, press the crown. Day quick-set OK, press the crown with the 12 o'clock side down. 0-second adjustment OK, press the button at 7 o'clock. Accuracy is currently being checked. There is some delay, so it needs to be adjusted about once every 3 days. Thank you for viewing.