Nezumi’s updated Baleine BA4.102 keeps the Miyota 9039 automatic movement and 200 m water-resistance rating while giving the diver a slimmer case, ceramic bezel insert and more layered dial. Nezumi lists a 40 mm diameter, 12.1 mm thickness and 47 mm lug-to-lug; Fratello reported launch prices of €630 on rubber and €695 on bracelet, excluding taxes. Those are November 2025 launch figures, not confirmed current checkout prices.
What changed on the updated Nezumi Baleine?
Fratello’s November 17, 2025 launch coverage describes the BA4.102 as a brushed stainless-steel redesign. Its bezel measures 39 mm within the 40 mm case, and the case profile is 12.1 mm thick while retaining a 47 mm lug-to-lug span. The redesigned watch also uses a ceramic bezel insert, double-domed sapphire crystal and a textured, layered dial. Applied brushed numerals and indices carry Grade X1 Super-LumiNova, and the hands have been redesigned.
These are design changes reported by Fratello; the dimensions and component specifications are also listed on Nezumi’s BA4 press page. The narrower bezel dimension is not the case diameter: the watch itself measures 40 mm across.
What stayed the same?
The updated Baleine retains the Miyota 9039 automatic movement, according to Fratello’s launch report. Nezumi specifies the same movement on its BA4 press page, along with a 28,800-vibrations-per-hour rate and power reserve of up to 42 hours. It is a no-date movement, so the dial has no date window.
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- Round watch featuring corrugated unidirectional bezel, luminous hands/markers, and magnified date window at 3 o'clock
- 40 mm, Length: 210mm, 23k gold-plated stainless steel case with mineral dial window. Movement Caliber: NH35A
- Japanese automatic movement with analog display
- Gold & Stainless steel tone bracelet with foldover clasp with safety closure
- Water resistant to 200 m (660 ft): In general, suitable for professional marine activity and serious surface water sports, but not scuba diving.
Nezumi also states a 20 ATM / 200 m water-resistance rating. That is the manufacturer’s published specification, not evidence of independent testing or dive-watch certification. The rating alone does not establish that an individual watch is ready for a particular dive; follow the manufacturer’s care and use guidance and have seals checked as appropriate.
Nezumi Baleine BA4.102 specifications
| Specification | Published detail |
|---|---|
| Reference covered in launch report | BA4.102 |
| Case diameter | 40 mm — Nezumi Studios |
| Bezel diameter | 39 mm — Fratello launch coverage |
| Thickness | 12.1 mm — Nezumi Studios |
| Lug-to-lug | 47 mm — Nezumi Studios |
| Lug width | 20 mm — Nezumi Studios |
| Movement | Japanese Miyota Cal. 9039 automatic, no date — Nezumi Studios |
| Beat rate | 28,800 vibrations per hour — Nezumi Studios |
| Power reserve | Up to 42 hours — Nezumi Studios |
| Crystal | Double-domed sapphire with internal anti-reflective coating — Nezumi Studios |
| Bezel insert | Ceramic — Fratello launch coverage |
| Lume | Super-LumiNova; Fratello specifies Grade X1 on applied numerals and indices |
| Water resistance | 20 ATM / 200 m, as stated by Nezumi |
Nezumi’s BA4 specifications are manufacturer-published details. Fratello’s launch coverage supplies the design comparison and reported bezel dimension.
Rank #2
- Stainless steel case 40mm diameter x 14mm thick; Exhibition case back; Black dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 152 grams
- Stainless steel band, 205mm L x 20mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Unidirectional stainless steel bezel with black top bezel ring; 200 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
How does the BA4.102 compare with its predecessor?
Fratello characterizes the update as a redesign rather than a change to the watch’s movement. The most useful points of comparison are its slimmer stated profile, ceramic bezel insert, double-domed sapphire crystal, layered dial with applied markers and updated hands. The Miyota 9039 remains the movement. These details describe the published design and specifications; they do not establish changes in accuracy, durability or real-world performance.
How much did the updated Baleine cost at launch?
Fratello reported November 2025 launch prices of €630 for the rubber-strap configuration and €695 for the bracelet configuration, with taxes excluded. The difference between those reported launch prices was €65. They are dated launch figures, not verified prices for October 2026; current price, tax treatment, stock and configuration availability should be checked with Nezumi before purchase.
Rank #3
- Steel and gold tone stainless steel case 40mm diameter x 14mm thick; Exhibition case back; Black dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 152 grams
- Steel and gold tone stainless steel band, 205mm L x 20mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Unidirectional stainless steel bezel with black top bezel ring; 200 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
- Automatic movement means that this timeless watch powers a quality Japanese-automatic movement with the simple movement of your arm.
| Configuration | Reported launch price |
|---|---|
| Rubber strap | €630, excluding taxes — Fratello, November 2025 |
| Bracelet | €695, excluding taxes — Fratello, November 2025 |
The launch report does not establish a weight or comfort advantage for either configuration, so choosing between them is a matter of preference rather than a documented performance difference.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which Baleine version is being discussed?
BA4.102 is the reference covered by the November 2025 redesign report. Nezumi’s current catalog also lists BA4.202, described as a limited edition, so reference numbers and colorways should be checked before comparing prices or specifications. The Nezumi All Watches catalog is the relevant place to confirm which references are currently listed.
Rank #4
- Steel and gold tone stainless steel case 40mm diameter x 14mm thick; Exhibition case back; Blue dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 152 grams
- Steel and gold tone stainless steel band, 205mm L x 20mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Unidirectional stainless steel bezel with blue top bezel ring; 200 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
Time+Tide reported a tonal-grey limited edition of 300 pieces with a planned December 1, 2025 release. That is a reported launch plan, not confirmation of current stock or remaining availability. See Time+Tide’s launch coverage for that dated report.
Quick Recap
Best Value
- Stainless steel case 42mm diameter x 14.2mm thick; Exhibition case back; Black dial; Luminous hands and hour markers
- NH35A Japanese Automatic movement, 24 jewel; Assembled in Malaysia; Watch weight: 142 grams
- Stainless steel band, 215mm L x 22mm W; Band is adjustable by adding/removing links; Fold over safety clasp
- Mineral crystal; Screw-down crown; Uni-directional stainless steel bezel with blue and red top bezel ring; 200 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
