Over the past few years, multiple factories have been churning out replicas of the Audemars Piguet Royal Oak 15500 and 26240, but only a handful have actually nailed the movement. In May 2026, ZF factory dropped their new replica watches — the Royal Oak 26240 V2 and the 15500, both equipped with a true free-sprung balance wheel movement.
With APS factory now shut down, ZF factory is pretty much the only one left still sticking to a real free-sprung balance structure for these two models. For people who care about movement accuracy, this is a shift really worth paying attention to.
How to quickly spot a real free-sprung balance vs a fake one
A genuine free-sprung balance has actual adjustable weights on the balance wheel, while most versions just copy the look of those weights without any real adjustment function.
The easiest way to tell is just two steps:
- Check if there are real balance weights on the balance wheel: real ones are separate adjustable weight blocks mounted on the rim, with clear 3D depth and gaps.
- Look for a hidden regulator arm: fake free-sprung designs cut costs by using fake weights and still rely on the traditional regulator arm to adjust timing. If you spot that hidden arm under the balance cock, no matter how good those weights on the wheel look, it’s fake.
How to tell if a ZF factory replica watch truly has a free-sprung balance
Take the DD4401 movement for example. If you look closely at replica watch images, you’ll notice its balance wheel has no weight blocks at all and hides a regulator arm — a classic fake free-sprung setup. On the other hand, the APS factory SH4401 V2 version shows clearly visible balance weights, which is a real free-sprung structure.
Using this standard, when you check the JH4401 movement in the ZF factory 26240 — independent balance weights on the wheel are confirmed, and there’s no trace of a hidden regulator arm. This is a true free-sprung structure. Just on this point alone, it already stands out from the vast majority of lookalikes on the market.
What advantages does ZF factory have over APS factory for the Audemars Piguet Royal Oak 15500?
APS factory’s 15500, though the movement structure was in place, had one constant hidden flaw — dial font accuracy. Every single letter showed differences compared to GEN, and once you notice it, that difference becomes hard to ignore.
With this update, ZF factory’s 15500 has clearly improved the dial font, with overall letter accuracy closer to GEN.
Shifts in the 2026 replica watch market
Over the past years, despite heavy competition, APS factory was the dominant player in the AP field. Its free-sprung structure and fine attention to detail made it the go-to choice for many. APS was once considered better than ZF, but market conditions shifted, and APS stepping away left room for ZF.
ZF factory picking this exact moment to drop free-sprung versions of the 15500 and 26240? The intention is clear — catching the demand left behind by APS. For many friends, if you’re after a true 1:1 best replica watch with a structurally accurate movement right now, ZF factory has become the only choice.
Why can’t cheap versions do a real free-sprung balance?
If a free-sprung balance is so good, why don’t other factories make it real? Answer is simple — cost.
A real free-sprung balance requires installing multiple adjustable weight blocks onto the balance wheel, whereas a fake one only needs a mold with a few indentations or fake screw heads. Stamp it out and it’s ready to use.
Not that the tech can’t do it, but the cost just doesn’t allow it. ZF factory pulling off a true free-sprung integrated movement at this price point shows they really put down money on supply chain and quality control.
Is a ZF factory free-sprung movement replica watch worth buying?
This really comes down to the actual situation. If you don’t care about movement structure at all and only look at outward appearance, there’s no real need to focus on ZF factory. There are plenty of lower-priced versions out there that look pretty much the same, and when worn on the wrist for photos, the difference is basically zero.
But if you care a lot about movement accuracy, that’s a different story. The difference between a real free-sprung and a fake free-sprung is hard to hide from people who know what they’re looking at. After APS factory closed down, ZF factory is the only one that meets all three conditions — true free-sprung movement, integrated movement, and high-accuracy dial font. Definitely worth buying.
Future outlook on replica watch free-sprung balance technology
Right now, the JH4401 movement used in the ZF factory 26240 represents the highest level of movement research in China’s replica watch market, but this is just the starting point. As processing technology improves, we could see the adjustment precision of the balance weights get even better, possibly even getting close to gen-level fine-tuning feel. ZF factory kicked this off — who’s picking up the baton next? Worth keeping an eye on.
