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The Star Legacy Moonphase is Montblanc's clearest argument that the brand belongs in a serious watch conversation. A classical moonphase at 6 o'clock, a properly in-house movement, and a 42mm steel case that fits the dress category without being precious about it. No tricks, no gimmicks , just a traditional complication done at a price that leaves money on the table for the next watch.
Montblanc relaunched the Star Legacy family as its core traditional round dress line in 2018, repositioning the brand away from its pen-company-makes-watches reputation toward genuine manufacture credibility. The 128682 arrived with the MB 29.21, an in-house automatic with 68 hours of power reserve and a moonphase display that advances roughly once every 29.5 days, accurate to one day every 122 years. The Star Legacy case is clean and conservative, with a dial layout that puts the moonphase at 6 and a date window at 3.
This is not a complicated watch in any engineering sense, but it is a considered one. Montblanc has kept the reference in active production since launch, which speaks to steady demand from buyers who want the complication without paying Patek or Lange prices.
The moonphase disc on early examples has been reported to sit slightly proud of the dial aperture on a small percentage of units , inspect the display aperture closely before accepting delivery, new or pre-owned. The alligator strap on new examples is decent but not exceptional; budget for a replacement if you plan to wear this regularly. Water resistance is 30 meters, which is fine for a dress watch but means splash exposure only , do not swim in it.
Pre-owned pricing has compressed as supply has grown, so paying above the current grey market rate for a lightly worn example is difficult to justify. Verify the power reserve indicator if the watch has a display back version; the 29.21 does not have one on the 128682, but this reference is sometimes confused with other Star Legacy variants that do.
New retail sits around $4,500 to $5,000 USD depending on strap configuration. Grey market and pre-owned examples in excellent condition can be found in the $2,800 to $3,500 range, which represents strong value for an in-house moonphase. The 128682 does not appreciate , it is a wearer's watch, not a speculation target , but the depreciation curve has flattened now that it has been in the market several years.
The MB 29.21 is a Montblanc in-house caliber and must be serviced at a Montblanc authorized service center or an independent watchmaker with documented access to manufacturer parts. Recommended service interval for the 29.21 is every five to seven years under normal wear. Setting the moonphase correctly after a service or extended storage requires patience: advance it slowly through the corrector to match the current lunar cycle rather than forcing it, as the disc mechanism is not designed for rapid adjustment.
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Dress watch with moon phase; the polished case must be in factory condition and the moon disc must show correct phase.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Moon phase accuracy | Moon disc shows correct lunar phase relative to actual moon; setting confirmed via lunar calendar | Incorrect lunar phase; moon disc not set or moon mechanism not advancing |
| case | Case finish condition | Polished case in factory condition; no over-polishing or re-polishing | Over-polished case; case re-polished removing original surface character |
| caseback | Cal. MB 29.21 movement | MB 29.21 with moon phase module visible through caseback; Minerva-heritage finishing | Non-in-house movement; movement swap |
