Clone Movement Power Reserve: 2026 Benchmark Report

Testing Protocol

A power-reserve figure is only meaningful if you know how it was obtained, and the numbers that circulate for clone calibers are the stated specification — not a measured average. If you want to check one, the method is unglamorous: wind the movement fully, leave it dial-up and untouched, note the time, and check it every few hours until it stops. Ambient temperature and state of wind both matter, which is exactly why a single watch tells you about that watch and nothing about a production run.

Results Summary

The advertised reserves are around 70–72 hours for the VS3235, DD4130 and DD3285, 48 hours for the VS3135, and around 42 hours for the Miyota 9015 and the Asian 2836-2 — figures taken from factory claims and dealer listings, not from a bench test. We have not timed a batch, and we are not aware of anyone publishing a measured sample, so read the comparison as a statement of what is claimed rather than what was verified.

Amplitude Drop-off

Amplitude falls as a movement runs down, and that curve — not the headline reserve figure — is what owners actually feel: a watch can keep perfect time on the first day and drift noticeably on the third. Standard watchmaking guidance puts healthy amplitude at roughly 250–310 degrees, with rate stability degrading as amplitude drops toward 200. We do not hold per-caliber retention curves, and a page quoting precise amplitudes at 50%, 75% and 90% of reserve is quoting numbers someone constructed rather than measured.

Automatic Winding Efficiency

Winding efficiency is where cheap and expensive clone calibers separate in daily use, and you can test your own watch for it: leave it still for two days, then wear it normally and see whether it holds time through the following day. A caliber that recovers quickly from a stopped state is doing its job; one that needs a full hand-wind to get going is telling you something about its rotor and bearing quality. We are not publishing hour counts for that behaviour, because it depends on how much the wearer moves.

Long-term Power Reserve Stability

Power reserve does decline as a movement ages — lubrication dries, mainsprings lose a little energy, friction rises — but the size of that decline is a property of the individual watch and its service history rather than of the caliber name. We have not run a six-month re-test and will not publish invented percentages for one. The practical rule stands: when a watch that used to run all weekend starts stopping overnight, it is due for a service, and the reserve figure is the symptom rather than the diagnosis.