Short answer
A fake 1815 Rattrapante is a replica of A. Lange & Söhne's split seconds chronograph, and the name covers three different products: a dead lookalike with a fixed second hand, a working chronograph that only pretends to split, and a real split seconds mechanism built on a Chinese movement base. Only the third type does what the name promises. Prices run from about $150 for a lookalike to roughly $900 for a functional rattrapante, and none of them match the hand finishing or the gold alloy case of the original.
What the genuine 1815 Rattrapante is
A. Lange & Söhne sells the name in two forms: the 1815 Rattrapante Perpetual Calendar in platinum with the L101.1 caliber, and the 1815 Rattrapante Honeygold, a limited run of 100 pieces with a version of the same L101 family movement. Both are hand wound. Both use a rattrapante mechanism that can stop a second hand on command and let it catch the running chronograph hand again. Both sit in gold alloy or platinum cases with an argenté dial, and both are finished with Glashütte ribbing, screwed gold chatons, and a hand engraved balance cock.
The three replica tiers
1. Lookalike
Quartz or basic automatic movement, printed dial detail, correct looking pushers. The rattrapante pusher is decoration. Nothing separates, nothing stops, nothing catches up. This tier fails the first test and should never be sold as a split seconds watch.
2. Faux rattrapante
A working chronograph with a second central hand that stays locked to the first. Some versions have a pusher that moves a lever without touching the hands. Others simply duplicate the chronograph seconds hand for visual symmetry. It runs, but it does not split.
3. Functional split seconds
Built on a Seagull ST19 base with an added split seconds module, or on a custom movement made for this case. The two central hands separate and rejoin under finger pressure. This is the tier most buyers want and the tier that costs the most.
How to verify a working rattrapante before you buy
- Start the chronograph with the upper pusher and watch both central hands sweep together.
- Press the rattrapante pusher at 4 o'clock while the chronograph runs and confirm the split hand stops while the other hand keeps moving.
- Read the gap between the two hands. A working rattrapante shows a clear, growing offset.
- Press the rattrapante pusher a second time and confirm the stopped hand jumps forward and rejoins the running hand.
- Stop the chronograph with the upper pusher, then reset it, and confirm both hands return to 12 in one motion.
- Repeat the full sequence three times to rule out a mechanism that works once and then binds.
What separates a good replica from a bad one
- Case diameter and thickness close to the original, since an oversize case is the fastest visual tell.
- Subdial positions and calendar apertures in the correct places with the correct scale rings.
- Correct numeral font and the right word marks on the dial.
- Caseback with proper engraving depth and correct reference text.
- Hands that look like blued steel rather than painted blue.
Price bands
- $150 to $300: lookalike with quartz or basic automatic power and no split function.
- $300 to $550: working chronograph with a cosmetic split hand or a synchronized duplicate.
- $550 to $900: functional split seconds, often on a modified ST19 base.
Red flags
- A seller who never shows the split hand frozen at an angle.
- Photos where both central hands sit in perfect alignment in every frame.
- The phrase "Swiss movement" attached to a split seconds claim at a low price.
- No video of the pusher sequence.
- Thickness quoted as about 15mm with no caliber photo.
Operating and care notes
Press the rattrapante pusher only while the chronograph runs. Release the split hand before you stop or reset the chronograph, because resetting with a split hand frozen is the fastest way to bend a lever or break the module. A split seconds movement holds more parts than a plain chronograph, so service comes sooner and costs more. Keep it away from water, steam, and hard shock, and never hand wind it while the chronograph is engaged.
Bottom line
If the split function works under your finger, you bought a fake 1815 Rattrapante. If it does not, you bought a dial with the right layout and none of the point.