Serica Ref. 7505 Field Chronometer: Compact 35mm Design Meets COSC Precision
Serica Goes Compact with the Ref. 7505 Field Chronometer
French independent watchmaker Serica has expanded its lineup with the Ref. 7505 Field Chronometer, a 35mm COSC-certified timepiece that blends the brand's minimalist tool-watch DNA with a more design-forward aesthetic. Launched in May 2026, the Ref. 7505 represents Serica's response to the growing demand for smaller, more wearable watches that don't sacrifice presence or capability.
A Different Kind of Field Watch
While classified as a field watch in Serica's taxonomy, the Ref. 7505 departs significantly from the military-derived designs typically associated with the genre. The case features bold, angular lines with a proportionally wider fixed bezel adorned with polished hemispherical studs at the cardinal points — a detail that gives the watch a distinctively non-utilitarian character.
Key dimensions:
- Diameter: 35mm
- Thickness: 9.6mm (including domed sapphire crystal)
- Lug-to-Lug: 41.5mm
- Lug Width: 20mm
- Water Resistance: 200 meters
Dial Options
At launch, Serica offers three enameled dial variants:
- Black Minute Critical Dial — utilitarian aesthetic
- Olive Green Minute Critical Dial — military-inspired
- TXD (Tuxedo) Dial — black and tan with applied hour markers and C3 Super-LumiNova
All three feature the brand's signature luminous hands, which emit a green glow matching the hour markers.
The Movement: Soprod Cal. M100
Powering the Ref. 7505 is the Soprod Caliber M100, an automatic movement often compared to the ETA 2892 and Sellita SW300 due to its similar external dimensions. However, the M100 is based on a completely different architecture. Key specs include:
- Frequency: 28,800 vph (4 Hz)
- Power Reserve: 42 hours
- Jewels: 25
- Certification: COSC Chronometer (-4/+6 seconds/day)
The Bonklip Bracelet with Safe-Lock Clasp
The Ref. 7505 debuts Serica's new "Safe-Lock" clasp, which adds a folding safety latch to the brand's signature infinitely adjustable Bonklip-style bracelet. The system allows wearers to clip the clasp into horizontal spaces between links for a custom fit every time they put the watch on. Despite the integrated appearance, standard 20mm straight springbars mean the watch is compatible with countless aftermarket strap options.
Pricing and Availability
The Serica Ref. 7505 Field Chronometer is priced at:
- €1,090 EUR (~$1,300 USD) for Minute Critical Dial versions
- €1,190 EUR (~$1,420 USD) for the TXD version
Frequently Asked Questions
Is 35mm too small for a field watch?
Not necessarily. The Ref. 7505's wider bezel and protruding studs create surprising visual presence despite the compact diameter. Many collectors find 35mm to be an ideal "Goldilocks" size for daily wear, particularly for those with smaller wrists or who prefer understated proportions.
How does the Serica Ref. 7505 compare to the Ref. 6190?
The Ref. 6190 is Serica's traditional 38mm field watch with twisted lugs and a more utilitarian design. The Ref. 7505 is an entirely different timepiece — more design-focused, with a different case profile and the new Safe-Lock clasp system.
Is the Ref. 7505 water resistant enough for swimming?
Yes. With 200 meters of water resistance and a screw-down crown and caseback, the Ref. 7505 is more than capable for swimming, snorkeling, and recreational diving.
Sources: aBlogtoWatch, Serica Official
Discover more about COSC certification or read our guide to watches for active lifestyles.