Seiko 5 (Seiko Five) Men' s Automatic Watch # SNKA07K1. Seiko Model: SNKA07K1. Movement: Automatic. Metal: Stainless Steel. Stainless Steel Bracelet. Black Dial 21 Jewels. Day Date Function. A mechanical self winding movement with Day and date function. With crystal see-thru Crystal caseback. Approximate case diameter with crown: 40mm. Approximate case diameter without crown: 37mm. Approximate case thickness: 10mm. Approximate bracelet width 20mm.