First Generation Seiko Sportsmatic Calendar Silk-textured dial Sportsmatic Calendar with calendar function on cal245 SS・19 jewels cal790 The Sportsmatic was designed with a crown that fits within the case to fully showcase the automatic winding. It's characterized by a winding at the 12 o'clock position and a single-point print of a link, reminiscent of the rotor's rotation. Seiko SEIKO Sportsmatic sportsmatic Calendar calendar Link mark Silk-textured dial ● While the Seiko Sportsmatic Calendar 820 and Seiko Sportsmatic 5 are commonly found, this model is rare and not often seen. ● This is the first generation of Sportsmatic, the origin of the Five series. ● This product seems to have had a refined design. ● Wrist size approximately 16-20cm (adjustable) ● Lug width 18mm ● Rare item ※ Please read the following description carefully. ※ Junk item, parts item, item with issues ※ After setting the time, it runs slow by about 45 minutes and then keeps time. ※ Overhaul or repair is likely required for regular use. ● Please examine the photos carefully to assess the condition. ● If you would like to see more details, I will add more photos, so please comment. ● If you have any other questions, please feel free to comment.