Yema Watch: Superman Slim Blue CMM.20

Yema Superman Slim Blue: A slim micro-rotor diver

The Yema Superman Slim CMM.20 Blue, reference 11.24.55.SN.M3, brings together two worlds rarely associated with each other: that of the diver and that of the slim watch. Its blue enamelled lacquer dial adds depth to the color, with a sheen that evolves according to the angle of the light. Around it, the blue bezel and steel bracelet maintain the codes of the Superman. But the profile changes: this Slim version focuses on more discreet proportions, without abandoning its nautical vocation.

The 39 mm 316L steel case is only 9.95 mm thick. Curved lugs, vertical brushing, and slightly arched polished chamfers complement this silhouette. The 2 mm double-domed sapphire crystal provides the vintage relief that is part of the collection's charm, while the polished steel hour and minute hands respond to the sheen of the dial. The white seconds hand and Grade A Super-LumiNova complete the reading markers when the light fades.

The slimness finds its explanation inside: the manufacture CMM.20 calibre with tungsten micro-rotor ensures automatic winding with a compact architecture. It powers the hours, minutes, and central seconds, without a date, at a frequency of 28,800 vibrations per hour, or 4 Hz. Its 70-hour power reserve allows, when fully wound, for the watch to be set aside for a weekend. The announced precision is −3 to +7 seconds per day. The transparent sapphire case back allows you to observe this mechanism rather than just reading its specifications.

The brushed steel Scales Slim bracelet hugs the 20 mm lugs and tapers by 4 mm towards the clasp. Its scale design takes up a historic signature of the Superman, with a double-security folding clasp and a diving extension for wearing it over a wetsuit. The screw-down crown, the unidirectional bezel with sapphire insert and bezel-lock, as well as the 300-meter water resistance, remain present. Manufactured, assembled, and adjusted in Morteau with French and Swiss components, the movement gives this slim watch a very concrete horological identity.

Technical characteristics

• Brand: Yema
• Collection: Superman / Yema manufacture
• Model: Superman Slim CMM.20 Blue
• Reference: 11.24.55.SN.M3
• Movement: Self-winding mechanical
• Calibre: Manufacture Morteau 20 (CMM.20), tungsten micro-rotor on ball bearings
• Movement origin: Designed in Switzerland; French and Swiss components; manufactured, assembled and adjusted in Morteau, France
• Frequency: 28,800 vibrations per hour (4 Hz)
• Power reserve: 70 hours
• Announced precision: −3 to +7 seconds per day
• Functions: Hours, minutes and central seconds; no date
• Case: 316L stainless steel, vertical brushing and slightly arched polished chamfers; curved lugs
• Diameter: 39 mm
• Lug-to-lug: 48 mm
• Thickness: 9.95 mm
• Lug width: 20 mm
• Crystal: 2.00 mm thick double-domed sapphire
• Case back: Transparent sapphire, with unique serial number
• Dial: Blue enamelled lacquer, glossy finish; "Manufacture française" inscription at 6 o'clock
• Hands: Polished steel hour and minute hands; white seconds hand
• Indices: Printed
• Luminescence: Grade A Super-LumiNova on hands, indices, and the bezel marker at 12 o'clock
• Crown: Screw-down, double O-ring seal, embossed Yema logo
• Bezel: Unidirectional, blue sapphire insert graduated from 0 to 60 minutes; luminescent marker at 12 o'clock; Superman bezel-lock patented since 1967
• Bracelet: Scales Slim in brushed 316L stainless steel; 20 mm width, 4 mm taper towards the clasp
• Clasp: Double-security folding clasp with diving extension
• Water resistance: 300 meters / 30 bar
• Box: Wooden presentation box and international warranty card in black PVD steel
• Brand origin country: France
• Yema warranty: 5 years

Why choose this watch?

For a diver whose slimness is also visible in profile. The 39 mm case and 9.95 mm thickness give the Superman a contained presence, while the curved lugs complement the bracelet's design. An interesting proposition if you like diving watches but are looking for a more discreet silhouette for daily wear.

For the mechanics that you discover when turning the watch over. The tungsten micro-rotor contributes to the slimness of the CMM.20 and allows its architecture to be observed through the sapphire case back. The 70-hour power reserve adds flexibility if you rotate between several watches, provided it is sufficiently wound when set down.

For the character of its blue enamelled lacquer dial. The glossy surface and double-domed crystal multiply the plays of light, while the polished hands and white seconds hand structure the display. Without a date window, the dial maintains a simple balance that allows the color to occupy center stage.

To retain the useful elements of a true diver. The 300-meter water resistance, screw-down crown, and unidirectional bezel with bezel-lock accompany nautical activities. The double-security clasp with diving extension completes this set, while the finish of the steel bracelet also allows the watch to be worn with more formal attire.

About the Yema brand

Yema watches have built part of their identity around instruments dedicated to sporting activities. Diving occupies a special place in this history: legible markers, a graduated bezel, and a construction adapted to water give the watch's design a concrete function. This lineage remains visible in the French brand's models.

The Superman collection retains its recognizable details while evolving them. The bezel-lock and the scales bracelet belong to this heritage; the Slim version combines them with a slimmed-down case and an enamelled lacquer dial. The hands have also been refined, and the seconds hand takes up the design of a historic Superman rather than the "shovel" shape found on other interpretations.

The Yema manufacture collection also highlights the work of the Morteau workshops. For the CMM.20, the components come from France and Switzerland, within the Jura Arc. The bridges and main plates are machined at Yema, where assembly and adjustment are also carried out. The transparent case back of this watch allows you to discover this micro-rotor mechanism as an extension of its exterior design.