CT724 – Marine Master 300 “MM300” SKX007 Conversion Case


Marine Master 300 “MM300” SKX007 Conversion Case – CT724

  • The famous limited edition CT710 Monobloc case was an iconic case in the seiko modding space. Since its retirement in 2022, we’ve been working on a new version with a screw down case back and takes our MM300 Bracelets and OEM bracelets. We are excited to release this V2 MM300 SKX007 conversion case into the modding space. Happy Modding!
  • Dimensions:
    • Lug-to-lug: 47.9mm
    • Thickness (w/o case back): 9.5mm
    • Width: 42.2mm
    • Lug Width: 20mm
  • Material – HQ Stainless Steel 316L surgical grade.
  • Finish: Polished on sides and brushed on top of case body.
  • Included FREE with every case – Crystal Gasket, Case Back Gasket, 2 x 20mm Fat Spring Bars, CT208 crown, CT502 stem.
  • Drilled Lugs
  • Water Resistance: This case was tested to 350M during development and subsequent testing of actual production cases – no failures were recorded.
  • Parts:
    • Fits All SKX007 parts excluding bracelets/straps.
    • Bracelets: This case takes our MM300 Bracelets and OEM bracelets. We’ve tested with OEM SBDX001/003/005, SBDX and SLA OEM bracelets.
    • Why does it come with a crown? The CT724 case takes SKX007 crowns – we’ve seen in the market today that some crowns are being produced over the 7mm diameter standard. All of our standard crowns fit as their diameter is 7mm. This includes the CT208, CT209, CT228, CT253, CT272 (not CT243 Big crown). We included a CT208 crown to ensure you have a crown that fits, and as a added bonus.

1 review for CT724 – Marine Master 300 “MM300” SKX007 Conversion Case

  1. Terje Kruse (verified owner)

    It took a while to receive the dial and hands, but it became a 6159 homage..

    Image #1 from Terje Kruse

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