Short Answer
A Fifty Fathoms replica with a full moon display copies the Blancpain Complete Calendar layout: day, date, month, and a moon phase aperture at 6 o'clock. The strong versions get the case size, the stepped bezel, and the aperture position right. The weak versions use a printed disc that drifts out of alignment, a window that sits off center, or a calendar that stalls after a few days. Judge the watch on the moon disc, the corrector pushers, and the calendar snap, not on the packaging.
Full Moon Watch Replica Guide: How to Choose a Working Moon Phase
What the Moon Phase Actually Shows
A moon phase display tracks the synodic month, the cycle from one new moon to the next, which runs about 29.53 days. Most watch movements use a 59-tooth disc carrying two moon shapes, so the disc advances one step per day and completes a full turn every 59 days. On the Fifty Fathoms Complete Calendar, that aperture sits at 6 o'clock below the date hand, framed by a polished ring. On the Bathyscaphe version the layout is cleaner, with a small seconds or date at the same spot.
Full Moon Fifty Fathoms Replica Guide: 1:1 Moon Phase Checks
Before You Order
- Choose the size you want: the 40mm Complete Calendar profile or the 43mm Bathyscaphe profile.
- Confirm the lug width so you can source a spare strap later, usually 20mm or 23mm depending on the model.
- Decide whether you want a corrector-pusher calendar or a crown-only calendar.
- Ask the seller for photos of the actual unit, not factory catalog shots.
How to Inspect a Full Moon Replica
- Place the watch under a bright lamp and look straight into the moon aperture.
- Check that both moon shapes sit level and centered in the window.
- Advance the moon disc with the corrector pusher and watch for a clean, single jump.
- Pull the crown to the time-setting position and wind the hands past midnight.
- Confirm the date and day flip within a few minutes of 12 o'clock.
- Press each corrector pusher and feel for a firm return with no grind.
- Measure the case across the bezel with calipers and compare it to the stated size.
- Wind the watch fully and let it sit overnight to test the power reserve.
Movement and Calendar Behavior
Most full moon replicas run on a modified automatic movement with a calendar module bolted to the base. The module is where quality shows. A good one changes the date with a short, positive snap. A poor one drags the date wheel and leaves the numeral partly visible for hours. Ask how the moon disc is driven. Direct gearing is reliable. A friction-fit disc that relies on tension can slip when the watch takes a knock.
fifty fathoms replica full moon
Case, Bezel, and Dial Details
The Fifty Fathoms case has a broad, slightly domed bezel with a sapphire or mineral insert and printed numerals. On a replica, check that the insert sits flush with the bezel edge and that the lume plots line up with the dial markers. The dial should carry applied indices with clean edges, a sunburst or matte finish that matches the reference, and hands with a beveled tip. Any bleeding around the printed logo means a soft pad print.
Setting Rules and Care
Do not set the date, day, or moon phase between roughly 9 p.m. and 3 a.m. The calendar mechanism is engaged during those hours and forcing a change can strip a tooth. Set the moon phase first, then the date, then the time. Keep the watch away from strong magnets, rinse the case with fresh water after salt exposure, and have the gaskets checked once a year if you swim with it.