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Description
ZF IWC Portugieser Chronograph IW371605
A breakthrough in horological replication, achieving genuine-spec thickness through a bespoke column-wheel movement architecture.
Powered by ZF Proprietary Clone 69355
The development of the 69355 clone movement allowed ZF to bypass the inherent dimensional limitations of the standard Asian 7750. This caliber features a functional column wheel, delivering tactile and precise feedback during chronograph engagement. The open caseback reveals perlage and circular graining that closely approximates the genuine finish, while the rotor operates with improved stability over earlier modular chronographs.
±10–15 s/day. Standard regulation for this complex chronograph clone prioritizes reliable engagement and amplitude stability.
- ✅ Power Reserve: Approximately 36 hours
- ✅ Complications: Fully functional Chronograph (Start/Stop/Reset) with vertical sub-dial layout
- ✅ Winding Direction: Bidirectional pawl winding system
Technical Specifications
41mm diameter with a precise 13.3mm thickness, featuring alternating brushed case flanks and polished bezel lugs that create an elegant dress profile.
Thermally quenched blue steel hands and applied Arabic numerals, displaying correct typographical spacing and a deep metallic luster.
Ultra-thin profile designed to maximize the dial aperture, mirroring the genuine’s expansive visual presence without adding unwanted bulk.
Equipped with an IWC-style deployant clasp featuring correct deep engravings and precise brushed/polished contrasts.
Why ZF for This Reference?
Many collectors ask: “Why not AZF?”
The ZF iteration remains the community benchmark primarily due to its proprietary 69355 clone movement, which allows the case to sit at the exact 13.3mm thickness of the genuine IW371605. Previous iterations and lesser factories rely on modified A7750 movements, resulting in a noticeably bloated case profile exceeding 14.5mm.
Full Disclosure: The factory-supplied leather strap is notoriously stiff out of the box; most serious collectors immediately upgrade to a premium aftermarket leather or alligator strap for optimal comfort.
LIVE PREVIEW
Data Sheet
| MODEL REFERENCE | IW371605 |
| FACTORY / VERSION | ZF Edition |
| MOVEMENT | ZF Proprietary Clone 69355 |
| CASE MATERIAL | 316L Stainless Steel |
| WEIGHT & THICKNESS | 87.6g | 13.3mm |
| CRYSTAL & LUME | Sapphire with Dual AR Coating | N/A |
| DIMENSIONS | 41.0mm × ~48.0mm × 13.3mmManual measurements — minor tolerances apply. |
| WATER RESISTANCE | 30m stated — professional pressure test recommended before swimming |
Collector Q&A
Q: Why is the thickness of this ZF model significant compared to older versions?
A: Older replicas of the Portugieser Chronograph used modified Asian 7750 movements, which forced the case thickness to exceed 14.5mm. ZF developed a custom 69355 clone movement, allowing this model to achieve the genuine-accurate 13.3mm thickness.
Q: Are the blue hands on the dial painted or thermally treated?
A: The hands and applied numerals on this ZF IW371605 are thermally quenched (fired) blue steel. This traditional horological process provides a deep, metallic luster that shifts under different lighting conditions, unlike the flat appearance of painted hands.
Q: Does the chronograph function work exactly like the genuine?
A: Yes, the ZF 69355 clone features a fully functional column-wheel chronograph. The top pusher starts and stops the central seconds hand, while the bottom pusher resets it. The vertical sub-dial layout accurately tracks elapsed minutes.
Q: What is the most common critique of this specific factory release?
A: While the case and movement are highly praised, the factory-supplied leather strap is noticeably stiff and lacks the supple feel of genuine IWC alligator leather. Most collectors factor in the cost of a high-quality aftermarket strap to complete the build.
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