OUPINKE 3178 Skeleton Automatic Watch – Roman Numerals, Rotating Seconds, Sapphire, 50M

OUPINKE 3178 Skeleton Automatic Watch – Roman Numerals, Rotating Seconds, Sapphire, 50M

The OUPINKE 3178 Trend Series is a 42mm skeleton automatic watch with a numbered bezel, raised Roman numeral hour markers, and an open-work dial exposing the gear train and movement architecture. Rotating small seconds display at 7 o’clock. Proprietary automatic movement, 21 jewels, 21,600 vph, 80-hour power reserve. Synthetic sapphire crystal. Tungsten and stainless steel diamond-link bracelet with butterfly double clasp. 12mm thick, 161g, 50M water resistance. 7 colour variants.

Key Specifications

Skeleton Dial and Roman Numeral Bezel

The 3178 uses an open skeleton layout with a numbered outer bezel — Roman numerals are printed on the bezel ring rather than applied as dial indices. The movement architecture, gear train, bridges, and screws are visible through the open dial from the front. The layered depth of the skeleton construction reads as a three-dimensional mechanical display under the sapphire crystal.

The numbered bezel distinguishes the 3178 from the 3168 (which uses applied Roman numerals on the chapter ring) and the 3179 (which uses applied lume indices). The bezel numerals on the 3178 are visible even in low light due to the contrast between the text and the bezel surface.

Rotating Small Seconds

A rotating small seconds sub-display sits at the 7 o’clock position — a dedicated seconds wheel visible as a spinning disc within the open movement layout. This is a separate display from the central seconds hand found on most three-hand watches. The rotating disc adds visible mechanical movement to the lower portion of the dial and gives the 3178 a two-register layout uncommon at this price point.

Movement — 21 Jewels, 80-Hour Reserve

The 3178 shares the same high-power-reserve proprietary movement as the 3168 — 21 jewels, 21,600 vph, approximately 80 hours of power reserve from full wind. This is significantly above the 40–45 hour reserve of NH35/NH36-class movements, meaning the watch will continue running through a full non-worn weekend and restart on Monday without manual intervention. For initial winding from a fully run-down state, rotate the crown clockwise approximately 30 times. Wears for 8–12 hours daily maintains full reserve via the rotor.

Synthetic Sapphire Crystal

Mohs 9 synthetic sapphire — scratch-resistant under daily wear contact with keys, coins, steel, and glass. On a skeleton watch the crystal quality directly affects the depth and clarity of the movement view — the sapphire allows full resolution of the gear train detail from a normal viewing distance.

Tungsten and Stainless Steel Bracelet

Tungsten carbide and stainless steel diamond-cut link bracelet — the same construction family as the wider OUPINKE range. Butterfly double clasp with push-button release. Bracelet circumference 20cm; link removal via standard pin tool. Weight 161g.

Colour Variants

All black — PVD black case, bezel, and bracelet. The most cohesive dark presentation; the skeleton movement reads as silver against the black surround.

Silver/black — silver case with black bezel and dark movement bridges. Two-tone contrast.

Black/gold — PVD black with gold-tone bezel and movement accents. The most dressed dark variant.

How the 3178 Compares to Other OUPINKE Skeleton Models

The 3178 and 3168 share the same 80-hour power reserve proprietary movement — the highest in the OUPINKE range. The 3178 has a round case at 42mm with a numbered bezel and rotating small seconds; the 3168 has a 41mm round case with floral engraved movement bridges. The 3179 is a tonneau skeleton with a sport character and a silicone strap.

For the full comparison: OUPINKE 3168 — floral engraved, no bezel numerals, 41mm. OUPINKE 3179 — tonneau, silicone strap, 39×46mm. Browse the full OUPINKE watches collection.

FAQ

What is the power reserve on the 3178? Approximately 80 hours from full wind — one of the highest reserves in the OUPINKE range, shared with the 3168. For initial winding, rotate the crown clockwise approximately 30 times. Wearing the watch 8–12 hours daily maintains full reserve through the rotor.

What is the rotating display at 7 o’clock? A small seconds sub-display — a dedicated rotating disc showing elapsed seconds, separate from a standard central seconds hand. It adds visible continuous movement to the lower portion of the dial.

Is the crystal sapphire? Synthetic sapphire, Mohs 9. Scratch-resistant under normal daily wear.

Is this watch waterproof for swimming? Yes — 50M / 5ATM, suitable for splash, rain, handwashing, cold bathing, and swimming. Not suitable for warm or hot water, steam, snorkelling, or diving.

How does the 3178 compare to the 3168? Both use the 80-hour proprietary movement with 21 jewels. The 3178 has a 42mm case, numbered Roman numeral bezel, and rotating small seconds sub-display; the 3168 has a 41mm case with floral engraved movement bridges and no bezel numerals. The 3178 is heavier at 161g vs 180g for the 3168.

OUPINKE Men Watch 3178

⌚Swiss registered brand : Exclusive patent-protected brand new hollow design, stylish and luxurious men’s automatic watch, Understated luxurydial will give you an extraordinary artistic beauty. High quality Tungsten Steel Strap and butterfly double buckle gives you a new classic definition.Stainless steel watch case back makes the skeleton watch more durable.
⌚Hollow Mechanical movement-men watches: Synthetic sapphire mirror. Tungsten steel stainless steel Strap/ Waterproof:50 meters/ Clasp:Butterfly double buckle / Case diameter:42mm/ Case thickness:12mm/ Strap width:20mm:/Ciroumference:20cm/Weight:161g:The watch is water resistance 160ft, suitable for daily use.
⌚Please Note : This automatic watches men which will stop working if you are not moving for a long time. Before used please shake it, rotate the crown 15-20 rpm, manually wind the mainspring, the watch will get enough power.
⌚Suitable for the Crowd : It can suit for teenage and mature male. You can wear it on business and casual daily,watch is elegant packaged in a fashion and luxurious watch box. can be took in work/ travel/ festival…An ideal gift on birthday/ Christmas/ Father’s day/ New year/ Best friends gifts/Recommend this men’s watch as his best gift。
⌚What you get : Each product has a 60-Days refund and a Life-time warranty. If you have any questions about the product, please contact me immediately and we will give you a satisfactory solution.