The short answer
Judge a Vacheron Constantin Pontes Duo moon phase replica by its caseback before you look at anything else. The dial draws the eye, but the back is where budget builds expose themselves: shallow laser engraving with soft edges, a snap-on lid pretending to be a screwed back, hazy sapphire, uneven gasket seating, and a moon phase corrector that sits proud of the case surface. Ask the seller for macro photos of the caseback straight on and at a low raking angle under strong light, confirm the engraving depth and letter spacing against the reference you are copying, and match the closure hardware to that reference. If the seller cannot produce sharp close-ups of the back on request, move on. Everything else about the watch can be photographed to flatter it. The caseback cannot.
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What to look for in the caseback
Closure type and screw hardware
The reference you are buying against uses a specific closure: either a screw-down back with a fixed screw count or a threaded bayonet fit. Count the screws. Check that each head sits flush with the surrounding metal, that the slots are cut at a consistent depth, and that the slots are aligned or deliberately staggered in the pattern the original uses. Threads should engage without grit. A back that lifts off with a fingernail is a snap-on lid, and snap-on lids on a watch marketed as a screw-back copy tell you the rest of the case was built to a price.
Crystal clarity and gasket seating
An exhibition back should carry flat or lightly domed sapphire that reads colorless, not gray or green, with anti-reflective coating on the inside face. Look at the edge where crystal meets metal: a clean chamfer and a thin, even black gasket line mean the parts were machined to fit. Glue squeeze-out, a wavy gasket, or a crystal that sits below the surrounding rim are signs of assembly by eye rather than by tolerance.
Engraving, hallmarks, and serials
Genuine engraving is cut or stamped with crisp shoulders and a visible floor inside each letter. Replica engraving is often lasered, which leaves a shallow dish, a faint burnished halo around the strokes, and letters that thin out at the curves. Compare the weight of the brand text, the placement of the precious metal marking, and the spacing of any reference or serial line. On gold-plated cases the hallmark is frequently missing entirely, or stamped in a shape that does not match Swiss precious metal marking conventions. A seller claiming solid gold at an implausible number is describing plating.
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Finishing visible through the back
Geneva-style decoration is the fastest tell. Cotes de Geneve stripes should catch light and shift as you tilt the photo, with sharp boundaries at the bridge edges and hand-bevelled corners. Circular graining on the mainplate should show concentric rings. On weak builds this decoration is printed or stamped in one pass, so it looks flat and identical across every surface, with no directional change under light and no chamfer work at all. Blued screws should be a deep even blue, not painted heads.
Moon phase corrector and aperture
The corrector should sit recessed in the case band, centered on the moon disc, and require a pin tool rather than a fingernail. The aperture edges should be chamfered and the disc beneath should show a defined star field, a moon with clean terminator edges, and no ink bleed at the calendar window. Ask the seller to advance the moon phase through a full cycle on video if you can. A disc that jumps two positions per press is a mechanism mismatch, and a 30-day gear printed as a 29.5-day cycle will drift out of alignment within weeks.
Parameter bands that separate a solid build from a weak one
- Case diameter: 38 mm to 42 mm, matching the reference you are copying
- Case thickness: 9.5 mm to 11.5 mm, with the back curving inward at the lugs
- Caseback crystal: 1.2 mm to 2.0 mm sapphire, coated on the inner face
- Screw count: 4 to 6, heads flush within roughly 0.1 mm of the surface
- Engraving depth: 0.10 mm to 0.20 mm, with defined inner walls
- Moon aperture: 6 mm to 8 mm wide, edges chamfered rather than sharp
- Corrector recess: 0.3 mm to 0.6 mm below the case band surface
- Weight: roughly 60 g to 90 g in steel, 100 g to 140 g in solid gold
Common pitfalls
- Stock photos of a genuine watch used to sell a different build. Ask for a dated photo of the actual caseback.
- Snap-on backs described as screw-down. Insist on a photo of the threads or the screw seats.
- Printed perlage and printed stripes that look correct in a flat photo and dead in raking light.
- Letter spacing that drifts across a long engraving line, a sign of a single laser pass with no layout check.
- Water resistance claimed on a back with no gasket, or with a gasket that is pinched at one point.
- Swiss origin claims that cannot be supported, since Swiss Made status carries a defined manufacturing cost threshold.
- A moon phase set by the crown date position, which usually means the complication is decorative rather than geared.
FAQ
Should I pay more for an exhibition caseback?
Only if the movement underneath rewards it. A display back on a poorly decorated movement is worse than a solid back, because it invites the closest inspection the watch will ever get. Buy the finishing, not the window.
How many photos should I request?
Four is a reasonable minimum: caseback straight on, caseback at a raking angle, case edge showing the corrector, and a macro of the engraving. Add a short video of the moon disc advancing.
Can a jeweler verify the caseback for me?
Yes, and it is worth the fee on any expensive purchase. A watchmaker can check gasket condition, thread engagement, and whether the moon phase mechanism is geared to a true lunar cycle.
Is a replica serviceable?
Independent watchmakers can usually service or replace the movement, but parts specific to the case, crystal, and corrector are often unavailable. Weigh that against the purchase. A replica is not a genuine watch, carries no brand warranty, and must never be resold or represented as authentic.