【About the Product】 This is the Seiko Sportsmatic Calendar 820. It is one of Seiko's first automatic winding wristwatches, manufactured in the 1960s. It is an automatic winding watch without manual winding or hacking functions. This vintage model features a distinctive dial design where the indices are encircled. We offer high-quality vintage watches. 【Appearance】 ・Minor scratches overall ・The strap is not original 【Function】 ・Operates normally ※Regarding automatic winding accuracy: We do not perform precise mechanical daily rate measurements. While significant errors are unlikely, please understand this limitation. ※As a vintage item, water resistance is not guaranteed. 【About Product Descriptions】 Product descriptions are based on our subjective assessment. Describing the condition of vintage items solely with words is often difficult. We will post images highlighting any notable points about the item whenever possible, so please check those. 【Important Notice】 Import duties, taxes, and fees are the responsibility of the buyer. Before bidding, please check with your country's customs office regarding these additional costs. Delivery typically takes approximately one to two weeks from shipment.