Seiko 5 SNK366K1 Gold Automatic Watch Water Resistance 30 m (3 ATM). Number of Jewels 21 Jewels. Clasp Type Push button deployment clasp. Seiko 5 SNK366 SNK SNK366K Automatic FULL GOLD UK SELLER. Case Size 37.5 mm. The seller is fazlanitradingltd and is located in Ilford.