BERNY AMT358M Titanium Automatic Watch — Seagull ST1731, 40.5mm, 95g, 100m, Small Seconds

BERNY AMT358M Titanium Automatic Watch — Seagull ST1731, 40.5mm, 95g, 100m, Small Seconds

The BERNY AMT358M is a 40.5mm Grade 2 titanium automatic watch — Seagull ST1731 caliber with small seconds sub-dial at 6 o’clock and date display, sandblasted titanium case and bracelet at 95g, sapphire crystal with internal AR coating, screw-down crown and caseback, 100m water resistance, folding titanium clasp. Ten variants (AMT358M and AMT358MS) across black, white, blue, orange and green dials.

Key Specifications

Variants — Ten Configurations

AMT358MS (standard bracelet):

• AMT358MS-A: Black dial / white numerals
• AMT358MS-B: White dial / grey numerals
• AMT358MS-C: Blue dial / white numerals
• AMT358MS-ORG: White dial / orange numerals
• AMT358MS-GN: Green dial

AMT358M (alternate strap option — confirm from listing):

• AMT358M-A, AMT358M-B, AMT358M-C, AMT358M-ORG, AMT358M-GN

Confirm whether AMT358M vs AMT358MS designates strap type or another configuration difference from the product listing before ordering.

Seagull ST1731 — Small Seconds and Date

The ST1731 is from Seagull’s ST17 family — automatic, central hour, central minute, small seconds at 6 o’clock, date. At 20 jewels, 21,600 vph and 5.12mm movement height, the ST1731 is Seagull’s compact calendar-with-subdial automatic — producing both the small seconds register and the date display from a single movement.

The small seconds sub-dial at 6 creates a specific dial architecture — the seconds are displayed in a dedicated register rather than as a central sweep hand. This creates a quieter, more formal dial character appropriate for a titanium field-sport watch. The date window provides daily calendar reference.

Grade 2 Titanium — Confirmed Alloy

Grade 2 titanium (commercially pure titanium, ≥99% Ti) is the most common titanium grade for watch cases — softer than Grade 5 titanium (Ti-6Al-4V) but lighter, more corrosion-resistant and hypoallergenic. At 95g with the full titanium bracelet the AMT358M is significantly lighter than the equivalent stainless steel construction (typically 150–200g at 40mm with steel bracelet).

The sandblasted finish creates a uniform matte grey surface — contrasting with the polished chamfered edges of the lugs. Sandblasted titanium is more resistant to fingerprinting than polished titanium.

AR Sapphire Crystal

Internal AR coating on a sapphire crystal — same specification as the BERNY T2566M and AMT163M. The coating reduces reflective glare from the crystal surface, improving dial legibility in bright outdoor light. On a titanium field-sport watch used outdoors and near water, the AR coating is a practical specification.

100m Screw-Down Crown and Caseback

Both crown and caseback are screw-down — confirmed in the FAQ. The screw-down back eliminates the sapphire exhibition caseback but maximises the water seal. 100m with screw-down crown and caseback is genuine recreational swimming specification — appropriate for the AMT358M’s outdoor character.

AMT358M vs AMT163M — Two BERNY Titanium Automatics

Choose AMT358M for the Seagull ST1731 in-house movement, small seconds sub-dial character and the 10 colour variants including orange and green. Choose AMT163M for the lighter 56g Miyota 8215, the 24-hour inner scale and the nylon strap option.

Orange and Green Dial Options

The AMT358MS-ORG (orange numerals on white dial) and AMT358MS-GN (green dial) are specific colour options uncommon in the titanium automatic category. Orange numeral accents create the high-visibility field instrument character associated with aviation and dive watches. Green dial on a titanium bracelet watch is a contemporary and distinctive combination.

Who Is the BERNY AMT358M For?

The AMT358M is built for:

• Seagull ST1731 in-house automatic buyers who want the Seagull small-seconds caliber on a titanium watch
• Orange or green dial titanium buyers — uncommon colour options in this category
• 100m titanium automatic buyers who want confirmed swimming water resistance on a lightweight bracelet watch
• Small seconds sub-dial buyers who prefer the dedicated seconds register over a central sweep seconds hand

How It Compares

vs. BERNY AMT163M Miyota 8215 — See comparison table above.

vs. Steelflier SF751 NH35 — Steelflier uses NH35 at 40mm/200m in 316L steel at ~90g on leather. BERNY uses Seagull ST1731 at 40.5mm/100m in Grade 2 titanium at 95g on titanium bracelet. Different movements, materials and water resistance — choose Steelflier for 200m and NH35; choose BERNY AMT358M for titanium construction, Seagull in-house and 10 colour variants.

More from Jewelry Addicts

• BERNY AMT163M Titanium Miyota 8215 — sibling titanium automatic
• BERNY T2566M Titanium VH31 — titanium quartz field watch
• BERNY Watches — full BERNY range
• Best Automatic Watches Under $200 — full roundup