Seiko SRPB3X "Baby Monster" Automatic Watchsearch

Seiko SRPB3X "Baby Monster" Automatic Watch

Seiko SRPB3X "Baby Monster" Automatic Watch

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Diver-Style 24-Jewel Auto With Rotating Bezel

Seiko’s “Baby Monster” is derived from the company’s original “Monster” line, which featured the same chunky hands and dial layout. This version—much more affordable than its predecessor—scales the water resistance down to a still-commendable 100 meters, and swaps out the screw-down crown for a standard one. The case is certainly brawny (it’s called the “Baby Monster,” after all), and made from stainless steel with a mineral crystal. Lumed hands and markers make for good legibility in dark conditions, while a day-and-date window at 3 helps you track the day in English and Spanish. Time your mission with the notched unidirectional bezel. Giving life to the timepiece is Seiko’s 4R36 24-jewel movement, which can be seen via the exhibition caseback.

Note: At checkout, choose the SRPB37K1 or the SRPB39K1 (- $10). Quantities of each are limited.

Model Options

SRPB37K1 | Blue Dial, Blue Bezel, Stainless Steel Bracelet
SRPB39K1 | Orange Dial, Black Rubber Strap


  • Seiko
  • Movement: Seiko 4R36 24-jewel automatic
  • 21600 vph
  • 41-hour power reserve
  • Manual-wind compatible
  • Hacking seconds
  • Case material: Stainless steel
  • Crystal: Mineral
  • Caseback: Display
  • Day display in English & Spanish
  • Date window
  • Unidirectional rotating bezel
  • Lumed hands and markers
  • Case diameter: 44 mm
  • Case thickness: 13 mm
  • Lug width: 22 mm
  • Lug-to-lug: 51 mm
  • Water resistance: 100 m (330 ft)


All orders will be shipped by Massdrop.

Estimated ship date is Aug 27, 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.