PHYLIDA SE-31 NH35A Automatic Watch – 40mm Sapphire Classic

Phylida SE-31 – 40mm Automatic Watch with NH35A Movement & Double-Domed Sapphire Crystal

There is a gap in the automatic watch market between the cheap and unreliable and the genuinely good but genuinely expensive. The Phylida SE-31 lives in that gap and fills it well. A 40mm sport-classic automatic with a Seiko NH35A movement, a double-domed sapphire crystal with anti-reflective coating, a solid 316L stainless steel case and bracelet, a screw-down crown, and 100 meters of water resistance — this is the specification sheet of a watch that normally costs three times the asking price. The vertically-textured black dial gives it a refined, contemporary look that works equally well under a suit cuff, on a weekend, or at a dinner table.

Browse the complete Phylida watches collection at JwlrAddicts or read the full Phylida watches guide to understand how the SE-31 fits within the broader Phylida lineup.

Design — The Vertically-Textured Black Dial

The SE-31’s dial is clean but not plain. The vertical texture treatment adds depth and light interaction that a flat black dial simply cannot — the surface shifts as the light angle changes, adding dimension without complication. Roman indices and applied hour markers keep legibility sharp. The blue lume treatment on hands and markers provides low-light readability without dominating the aesthetic in daylight. The overall silhouette is sport-classic: a 40mm round case with a modest 14mm thickness, polished and brushed finishes on the 316L case, and a hidden push-button clasp on the bracelet that closes flush for a seamless wrist profile.

The SE-31 is available in two dial variants: Sterile Dial (no brand text on the dial face, clean and anonymous) and Branded (Phylida logo and model text present).

Key Features

• Seiko NH35A automatic movement — hacking, hand-winding, 41-hour power reserve
• Double-domed sapphire crystal — internal anti-reflective coating, superior scratch resistance
• 100M / 10 ATM water resistance — suitable for swimming, snorkeling, and active daily wear
• 316L solid stainless steel case and bracelet — corrosion-resistant, polished and brushed finish
• Screw-down crown and screwback caseback — enhanced sealing for reliable water protection
• Clean black vertical-textured dial — applied indices, blue lume hands and markers
• Hidden push-button clasp — flush bracelet closure, secure and refined
• Calendar date function — date display at 3 o’clock
• 40mm case diameter — classic dress-sport size, versatile for all occasions
• Two dial options — Sterile (no text) or Branded

Specifications

The NH35A Movement — What You’re Actually Getting

The Seiko NH35A is the caliber of reference for enthusiast-level affordable automatics. Manufactured by TMI (Seiko’s movement-making division) in Japan, it runs at 21,600 vph with a 41-hour power reserve. It hacks — the seconds hand stops when you pull the crown, allowing precise time-setting to the second. It hand-winds — you can bring a fully wound watch to life without wearing it. And it is globally serviceable, with watchmakers in every country familiar with its architecture. This is the same movement inside the Phylida AQUA AT150, the Phylida PT5000 No Time to Die Homage, the Phylida Lightning Hand Watch, and the Phylida SE-11 41mm Diver — a consistent foundation across the Phylida range that collectors have verified and trusted.

How the SE-31 Fits in the Phylida Lineup

The SE-31 is Phylida’s 40mm sport-classic everyday automatic — the model that splits the difference between a dedicated diver and a dress watch. If you want to step up to a dedicated dive watch from Phylida, the SE-11 41mm Diver adds 200M water resistance and a ceramic bezel at 41mm. For maximum depth rating, the Phylida 500M Diver goes to 500 meters at 43.5mm with a lumed ceramic bezel. For a more compact 38mm everyday automatic, the Phylida AQUA AT150 is the closest sibling. And for a bold, character-driven design with a lightning-bolt seconds hand, the Phylida Lightning Hand Watch at 39mm stands apart from anything else in the range.

Who Is the SE-31 For?

The SE-31 is for the man who wants one daily automatic that handles everything. The 40mm case size is the most universally versatile in men’s watches — comfortable for slender wrists, proportionate for larger ones, appropriate in formal and casual contexts equally. The 14mm thickness is slim enough for dress wear without compromising the structural integrity that 100M water resistance demands. The solid steel bracelet and push-button clasp add the kind of build quality that makes a watch feel premium the moment you put it on. This is a watch that punches well above its price, and Phylida’s growing reputation in the enthusiast community reflects exactly that.

Frequently Asked Questions

What movement does the Phylida SE-31 use? The Seiko NH35A — a Japanese automatic movement manufactured by TMI with hacking, hand-winding, and a 41-hour power reserve. No battery required; powered by wrist motion.

Does the SE-31 have a sapphire crystal? Yes. It uses a double-domed sapphire crystal with an internal anti-reflective coating. Sapphire rates 9 on the Mohs hardness scale — second only to diamond — and the dome profile improves light refraction and dial clarity.

Can I swim with the SE-31? Yes. At 100M / 10 ATM, the SE-31 is fully rated for swimming, snorkeling, and active water sports. The screw-down crown and screwback caseback maintain reliable sealing during submersion.

What is the difference between Sterile and Branded dial options? The Sterile Dial has no brand text on the dial face — a clean, anonymous aesthetic favoured by minimalists and collectors. The Branded dial features the Phylida name and model details on the dial.

What size is the SE-31? 40mm diameter, 14mm thickness, 48mm lug-to-lug, 20mm lug width. A classic, versatile size that suits most wrist sizes and fits easily under a shirt cuff.

Can I swap the bracelet for a different strap? Yes. The 20mm lug width is standard. Any 20mm NATO, leather, rubber, or aftermarket steel strap fits without modification.