Seiko 5 SNK357K1 automatic watch, blue dial, 37 mm case, 20 mm bracelet

Seiko 5 Automatic Watch with Day-Date

The Seiko 5 SNK357K1 is an automatic dress watch for adults who prefer mechanical movement without battery changes. Its 37 mm stainless steel case houses a 21-jewel Japan automatic calibre visible through the see-through skeleton case back. The blue dial features luminous hands and dotted index markers for low-light legibility. A white day-date window at 3 o'clock displays the day in English and Spanish.

Simple Strap Adjustment and Fixed Bezel

The 20 mm stainless steel bracelet fastens with a push-button deployment clasp that opens and closes without tools. Links can be removed by a watchmaker to fit wrists smaller than the supplied 8.25 inch length. The fixed bezel and Hardlex crystal require no user alignment, reducing the risk of accidental rotation or pressure damage during wear. No winding crown screw-down is present, so the crown should be pushed fully in after setting.

30 Metre Water Resistance Limits

The watch is rated to 30 metres, which covers splashes, rain and brief hand-washing but not swimming, showering or diving. The crown must remain fully pushed in to maintain this seal; operating it underwater will compromise the gasket. Hardlex crystal resists everyday scratches better than acrylic but is softer than sapphire, so contact with abrasive surfaces should be avoided. The automatic movement stops after roughly two days off the wrist and must be reset manually.