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Seiko Premier SSA Watch

Seiko Premier SSA Watch

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Open Heart, Display Caseback & 24-Hour Subdial

This open-heart watch by Seiko—complete with display caseback—offers a peek from two different perspectives at the 4R39A automatic movement. Vibrating at 21,600 beats per hour, this 24-jewel movement is capable of hacking and hand-winding. Overlapping the open heart is a 24-hour subdial, positioned at 10 o’clock, which is outlined in silver and adorned with Arabic numerals in intervals of two. In contrast to the Arabic numerals, Roman numerals mark each hour on the main dial, while second and quarter-second stick markers sit between each numeral. The watch is also fitted with feuilles hands, with the seconds hand featuring a crescent moon counterweight.

Note: At checkout, choose between the SSA231 (white dial/brown strap) and the SSA232 (PVD gold-tone case/white dial/brown strap), which is (+ $10). Quantities are limited to 40 units each. 

Seiko Premier SSA Watch
Seiko Premier SSA Watch
Seiko Premier SSA Watch
Seiko Premier SSA Watch
Seiko Premier SSA Watch
Seiko Premier SSA Watch

Style Options

White Dial/Brown Strap SSA231
PVD Gold-Tone Case/White Dial/Brown Strap SSA232 (+$10)


  • Seiko
  • Movement: 4R39A 24-jewel automatic
  • Hand winding compatible
  • Hacking seconds
  • 24-hour subdial at 10 o’clock
  • Crystal: Hardlex with anti-reflective coating
  • Hardlex crystal display caseback
  • Open heart
  • Case width: 41 mm
  • Case thickness: 12.75 mm
  • Lug width: 20 mm
  • Lug-to-lug width: 47.5 mm
  • Water resistance: 50 m (164 ft)


  • 1-year Massdrop warranty


All orders will be shipped by the vendor.

Estimated ship date is May 17, 2018 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.

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