ZF Edition — Leather Strap
ZF’s iteration of the IW371605 Portugieser Chronograph represents a significant technical milestone, resolving the historical thickness issues of earlier A7750-based replicas. By developing a bespoke movement architecture, ZF achieves the correct case proportions and sub-dial spacing required for this reference, making it the established benchmark on horological forums.
The proprietary ZF 69355 clone caliber features a functional column wheel and vertical clutch mechanism, ensuring crisp chronograph actuation. This architecture mirrors the genuine layout, allowing for an accurate open caseback display without the bloated profile of standard chronograph clones. Approximately 36 hours of power reserve.
Machined from 316L stainless steel, the 41mm case features alternating brushed flanks and polished lugs. The silver-plated dial is appointed with thermally quenched blue steel hands, providing a deep metallic luster rather than the flat appearance of painted alternatives.
- Movement: ZF Proprietary Clone 69355 (Column Wheel) — Approximately 36 hours
- Case Material: 316L Stainless Steel, 41mm diameter, ~48mm lug-to-lug, 87.6g
- Bezel: Polished 316L Stainless Steel, accurate ultra-thin profile
- Crystal: Sapphire with Dual AR Coating
- Bracelet: Blue Leather Strap with deployant clasp
- Water Resistance: 30m stated — professional pressure test recommended before swimming
This piece serves as an ideal dress chronograph for enthusiasts seeking a refined, historically accurate profile. Its precise 13.3mm thickness allows it to slide effortlessly under a tailored cuff.

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