TUDOR · 1926 Luna
TUDOR 1926 Luna M91560-0001: specifications and what to check
A moon phase dress watch at 10.1mm, running a T-series calibre rather than a manufacture MT. The 38-hour T607-9 is the specification to read carefully before quoting.
Reference M91560-0001 · specifications read from the manufacturer on 2026-09-22 · listed as current
Specifications
As published by TUDOR. A field the manufacturer does not state is left out rather than filled in.
- Case
- 39mm steel case with polished finish
- Diameter
- 39 mm
- Thickness
- 10.1 mm
- Lug width
- 21 mm
- Water resistance
- Waterproof to 100m (330 ft)
- Crystal
- Sapphire crystal
- Bezel
- Smooth bezel in steel with polished finish
- Dial
- Champagne-colour satin sun-brushed dial with applied numerals and moon phase indicator
- Crown
- Steel screw-down winding crown with the TUDOR logo in relief
- Bracelet
- Steel bracelet, 7 rows, satin-brushed external links, polished centre links
- Clasp
- Folding clasp with safety catch
Movement
- Calibre
- Calibre T607-9
- Type
- Self-winding mechanical movement
- Power reserve
- Power reserve of approximately 38 hours
- Notes
- TUDOR states no chronometer or Master Chronometer certification for this reference. It is not one of the in-house MT-series calibres used across the sports collections.
What to check before you buy
- Read the calibre before you quote anything. T607-9 is not a manufacture MT-series movement, carries no stated certification, and runs about 38 hours — roughly half what the sports references hold.
- Set the moon phase through a full cycle and check the disc steps cleanly without sticking or overshooting. Correcting a moon phase is fiddly, and a faulty one is a service visit rather than an adjustment.
- Avoid adjusting the moon phase while the calendar mechanism is engaged, and check the seller has not already damaged it by doing so — forcing a correction during the change-over window is the usual cause of failure.
- Examine the polished case for softened edges. A fully polished dress case shows past refinishing far more readily than a satin sports case does.
- Look along the 7-row bracelet for stretch. Many narrow links mean many pins, and a bracelet of this construction loosens visibly with age.
The movement is the thing to get right
Most of the TUDOR references documented here carry a manufacture MT-series calibre with COSC certification, METAS certification, or both, and sixty-five to seventy hours of reserve.
This one does not. It is specified with Calibre T607-9, a self-winding movement with a reserve of approximately 38 hours, and TUDOR states no chronometer certification for it. The Clair de Rose sits in the same position with its T601, also at 38 hours and also without a certification line.
None of that makes it a bad watch. It makes it a different watch, in a different part of the catalogue, and a dealer who describes it using language borrowed from the Black Bay pages is overstating what they are selling. The distinction is checkable in seconds by anyone who cares, which is exactly why it matters.
The practical consequence for an owner is simple: take it off on Friday evening and it may well have stopped by Sunday.
A moon phase is a mechanism to test
The champagne dial carries applied numerals and a moon phase indicator, and that complication should be exercised rather than admired.
Advance it through a full lunar cycle. The disc should step cleanly and land squarely, without hesitation or overshoot. And be careful when you do it: on most calendar mechanisms, correcting a complication while the change-over is engaged is what breaks them. Check whether the previous owner has already found that out.
Ten millimetres, and all polished
At 10.1mm deep this is genuinely a dress watch, and the case is polished throughout rather than mixing finishes.
Full polish is unforgiving. Every past refinish shows in softened edges and slightly wandering case lines, where a satin surface would have hidden the same work. Look along the lug edges at a shallow angle before agreeing a price — this is the reference in the range where over-polishing is easiest to spot and most damaging to value.
A seven-row bracelet ages visibly
Seven rows across this width means a large number of small links and a large number of pins. Bracelets built this way develop noticeable play as they wear, and the looseness is obvious in the hand even when it is invisible in photographs.
Hold it horizontally and watch for droop. It is a fair thing to price on, and a fair thing to disclose.
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Sources
Not affiliated with TUDOR. Specifications are read from the manufacturer's own published documentation on the date shown and may change; the manufacturer's current documentation governs.