Heimdallr · Factory brand · China
Heimdallr SKX007 Marine300
- Seiko NH35A
- 42 mm × 13 mm
- Sapphire crystal
- 200 m water resistance
Where to buy
- HeimdallrWorldwide
Movement
- Caliber
- Seiko NH35A
- Type
- Automatic
- Tier
- Entry
- Complications
- Date
- Frequency
- 21,600 bph
- Power reserve
- 41 h
- Hacking
- Yes
- Accuracy (factory)
- -20 / +40 s/day
Case
- Diameter
- 42 mm
- Lug to lug
- 46 mm
- Thickness
- 13 mm
- Lug width
- 22 mm
- Material
- Steel (316L)
- Hardening
- —
- Water resistance
- 200 m
- Crown
- Screw-down
- Case back
- Solid, screw-down
- Bezel
- ceramic insert, lumed
Crystal & dial
- Crystal
- Sapphire
- Shape
- —
- Anti-reflective
- Yes (side not stated)
- Lume
- C3 (green)
Bracelet & clasp
- Style
- —
- Links per row
- —
- Solid end links
- Yes
- Solid links
- —
- Link attachment
- —
- Taper
- —
- Quick release
- —
- Half links
- —
- Clasp
- —
- Micro-adjust
- —
- Diver extension
- —
Weight
- Head only
- —
- On bracelet
- —
- On strap
- —
Prices
Variants
| Name | Dial | Configuration |
|---|---|---|
| Black | black | 3-link or 5-link steel bracelet |
About this entry
74% of key specs known. Missing: weight, hardening, bracelet links, link attachment, clasp micro-adjust.
Seiko SKX007-style case with a Marinemaster 300-style dial and hands (the listing's infographics say "SKX Marine Master Style" dial and "MM300 Mod Hands"). Brand specs: 316L case and case back, 42mm without crown, 46mm lug-to-lug, 13mm, 22mm lugs, black ceramic bezel insert with green-glowing lume dot (bezel direction and clicks not stated), sapphire with AR coating (side not stated), screw-down crown and case, 200m. Lume: the spec block says "Japan Super Luminous C3 (Green)" while an infographic says "Super Luminova Swiss C3", so only "C3" is recorded. Movement: unlike the current Heimdallr listings, which name Hangzhou calibers, this listing still names a "Japan NH35A Automatic Movement" (an infographic adds "Original genuine Seiko (SII) NH35 / NH35A"), so the Seiko NH35A is recorded; date at 3. It is the same case and dimensions as the SKX007 V2K20 (skx007-v2k20), which has a Hangzhou 2553A day-date and BGW9 lume, so it is a separate model. The case back photo is solid, engraved with the Heimdallr logo and "200m". Offered on a 3-link (oyster-style) bracelet for $149 (crossed-out $229) or a 5-link (jubilee-style) bracelet for $159 (crossed-out $239); an infographic describes "316L stainless steel bracelet, solid-end links, milled clasp" (pictured on the 3-link bracelet). Both options were sold out on 2026-10-21, so the status is left unknown. Weight not stated. No independent review found.
Last verified: 2026-10-21. Edit or correct this entry.
Sources
- Heimdallr official store, SKX007 Marine300 Dive Watch accessed 2026-10-21