Quick answer
The replica Master Compressor Extreme Lab lives or dies by its movement and case hardware. A build worth owning runs a working automatic chronograph, has functional crown locks and pushers, measures close to the original at about 46.8 mm wide and 16.5 mm thick, and uses a sapphire crystal with a faint blue or colorless anti-reflective tint. A build to avoid runs quartz, has cosmetic pushers that do not move, and sits several millimeters too thick because the factory packed a spacer into a generic case.
Confirm the reference specs before you shop
The Extreme LAB 2 arrived in 2010 as a titanium sports chronograph with a function-selector crown, a 60-hour power reserve, and a case built around a compressor-style sealing system. Pull the manufacturer's own specification sheet and write down four numbers: diameter, thickness, lug width, and weight. Photographs hide scale, and sellers crop watches against plain backgrounds so the proportions look right. The numbers do not lie. If the seller cannot state the thickness, treat the listing as unfinished.
Movement checks
This is the check most buyers skip and the one that costs the most to fix.
- Wind the crown 20 turns by hand and listen for a dry scrape or a rotor that rattles against the caseback.
- Start the chronograph, let it run 30 minutes, then compare the elapsed counter against a phone timer.
- Reset the chronograph and watch whether all hands return to zero together or drift a half-second apart.
- Rotate the function-selector crown through each position and confirm a clean click at every stop with no slip.
- Set the watch down for 12 hours and note the rate change, which shows whether the movement has been regulated or just assembled.
Case and crown hardware
Run a fingernail along the case flanks. Sharp edges and machine marks mean the case was stamped and finished in a hurry. On the original, the crown locks compress against the case with a firm quarter-turn and the pushers sit flush. On a replica, the tell is play: press each pusher and feel for lateral wobble. Titanium builds feel light and warm in the hand; steel builds feel cold and heavier than the original ever does.
Dial, hands and crystal
Compare subdial spacing against a reference photo, not against another replica. Subdial rings that sit too close to the center, date windows cut off-center, and printed text with fuzzy or uneven strokes are the three flaws that show up in every batch. Check the crystal under a lamp at an angle. A heavy purple or mirror-green reflection means a cheap coating. Check lume by charging the dial under a lamp for 30 seconds, then stepping into a dark room.
Strap, clasp and fit
Ask for the lug width in millimeters and buy a replacement strap before the watch arrives. Aftermarket rubber and leather in the right width fix the most common complaint about replica Extreme LAB builds, which is a stiff strap with a strong plastic smell. Check the clasp for engraving depth and for a fold that snaps rather than grinds.
Water resistance claims
Treat every claim above 50 meters as marketing. Gaskets on replica cases are not pressure tested, and a compressor-style crown lock on a copy does not seal the way the original does. Do not swim, shower, or dive with the watch. If you need moisture protection, have a local watchmaker pressure test it first and accept the answer you get.
Price bands
- Under 150 USD: quartz or a decorated automatic, cosmetic pushers, mineral glass.
- 150 to 400 USD: working automatic chronograph, sapphire crystal, functional crown locks, uneven dial print.
- 400 to 900 USD: clone-grade movement, closer case proportions, better dial printing, correct hand shapes.
- Above 900 USD: thin margin over mid-tier builds, worth it only with clear movement provenance and photos of the actual watch.
Questions to send the seller
- Ask for the exact case diameter and thickness in millimeters.
- Ask which movement is inside and whether the chronograph is functional.
- Ask for a photo of the crown side with the pushers visible.
- Ask for a short video of the chronograph starting, running, and resetting.
- Ask about the return window and who pays return shipping.
Red flags
- Stock photos only, no images of the actual unit.
- Pressure ratings above 100 meters with no test documentation.
- A price far below the band for a working chronograph.
- A seller who will not confirm thickness or movement type in writing.