The Orient Star M45 F7 Mechanical Moon Phase RE-AY0121A is a limited edition of 180 pieces: a 41.0 mm steel automatic with a brown mother-of-pearl gradation dial, a true moon-phase disc, date, and a power-reserve indicator. Orient’s theme for this reference is a winter night on Lake Tazawa — the dial darkens toward the rim, with a silvery moon. Japan-made calibre F7M65, dual-curve sapphire with SAR coating, exhibition back, and a 50 m rating. If you want an Orient Star moon phase rather than a closed Contemporary dial, this is the brown RE-AY0121A.
Why the RE-AY0121A stands out
The dial is brown mother-of-pearl with a gradation that blacks toward the circumference, not a flat painted brown. Roman numerals, diamond-shaped hands, moon phase at 6, and the power-reserve display opposite keep the layout formal. The bezel and crown are brown-gold (bronze) colour plated on SUS316L steel. Front glass is dual-curve sapphire with Super Anti-Reflective coating; the back is flat sapphire, see-through, with limited-edition and serial engraving.
It suits someone who wants Orient Star’s flagship moon-phase architecture, and who prefers 41 mm over a 38.5 mm Standard. Lug-to-lug is 49.0 mm. Thickness is 13.8 mm. Official weight is 85 g on cordovan. Water resistance is 5 bar (50 m): rain and hand washing are in spec; it is not a 100 m sports Star. Official production is 180 pieces worldwide. Launched October 2023.
Who it is for
- Buyers who want a true mechanical moon phase on brown mother-of-pearl, not a closed silver-white Standard
- Wrists that wear a 41 mm dress case; 49.0 mm lug-to-lug, 20 mm strap
- People who like a Japan-made automatic with hand-winding, hacking seconds, date, and about 50 hours of reserve
- Anyone shopping Orient Star in Australia who wants authentic limited stock inspected before dispatch
Movement: calibre F7M65
F7M65 is Orient Star’s Japan-made automatic for this M45 Mechanical Moon Phase. It is self-winding with hand-winding and a seconds-halt (hacking) mechanism. Official figures: 22 jewels, +15 to −5 seconds per day in static testing, and a power reserve of over 50 hours. Functions: hours, minutes, seconds, date, power-reserve indicator, and a mechanical moon phase with an adjuster. You can top the mainspring up with the crown after a weekend off the wrist. The movement is visible through the sapphire exhibition back.
Case, crystal, and straps
The case is SUS316L stainless steel with a brown-gold colour plated bezel: 41.0 mm across (3–9 o’clock), 49.0 mm lug-to-lug (12–6), 13.8 mm thick. Front glass is dual-curve sapphire with SAR coating; the back is flat sapphire. The primary strap is brown cordovan leather, 20 mm at the lugs, with a push-button three-fold deployant clasp. Orient also specifies an additional SUS316L steel bracelet with a butterfly deployant. Official wrist range is 140–200 mm. Weight is 85 g. Water resistance is 5 bar (50 m). Magnetic resistance is JIS Type 1 (4,800 A/m or higher). Country of origin is Japan.
Technical specifications
- Brand / collection: Orient Star, M45 F7 Mechanical Moon Phase
- Reference: RE-AY0121A (store SKU RE-AY0121A00B)
- Edition: limited to 180 pieces
- Dial: brown mother-of-pearl gradation, moon phase, date, power-reserve indicator
- Movement: Orient Star F7M65 automatic, hand-winding, hacking seconds, 22 jewels, 50-hour reserve, +15 to −5 s/day (static)
- Case: SUS316L stainless steel, brown-gold plated bezel, 41.0 mm width, 49.0 mm lug-to-lug, 13.8 mm thick, screw-down sapphire exhibition back
- Crystal: dual-curve sapphire with SAR coating (front); flat sapphire (back)
- Strap: brown cordovan, 20 mm lug width, pusher three-fold deployant; extra SUS316L bracelet with butterfly clasp
- Water resistance: 5 bar (50 m)
- Weight: 85 g
- Origin: Japan
How it compares
The closed-dial Contemporary Standard, for example RE-AU0006S, is smaller (38.5 mm), 100 m, and a daily steel-bracelet Star without moon phase. The Classic Semi Skeleton RE-AV0001S is a 40 mm open-heart dress watch with boxed crystal, not sapphire. Classic Orient Bambino models stay mineral-crystal dress watches at a lower price; this Star adds the moon phase, dual-curve SAR sapphire, and a numbered run of 180.
Buying Orient Star in Australia
Chronospride lists authentic RE-AY0121A stock. We inspect the watch before dispatch. Free shipping Australia-wide applies on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page. Browse more of the line in Orient watches and Orient Star.
Authentic stock, inspected before dispatch. Free shipping Australia-wide on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page.
Frequently asked questions
What is the water resistance of the Orient Star RE-AY0121A?
Official water resistance is 5 bar (50 m). That covers rain and hand washing. It is not specified as a 100 m sports watch or a dive watch.
What movement does the RE-AY0121A use?
Japan-made Orient Star calibre F7M65: automatic with hand-winding and hacking seconds, 22 jewels, over 50 hours of power reserve, rated +15 to −5 seconds per day in static testing. It drives a mechanical moon phase (with adjuster), date, and a power-reserve indicator.
Is the RE-AY0121A dial painted brown or mother-of-pearl?
Orient specifies a brown gradation dial; press and retailer copy describe brown mother-of-pearl that darkens toward the rim (Lake Tazawa theme). It is not a flat painted brown Contemporary dial.
How many RE-AY0121A watches were made?
Official limited edition: 180 pieces. The exhibition back carries limited-edition and serial engraving.
What size is the M45 F7 moon-phase case?
41.0 mm width, 49.0 mm lug-to-lug, 13.8 mm thick, 20 mm lug width. Official weight is 85 g on the cordovan strap. An extra steel bracelet is specified by Orient.
Is the Orient Star RE-AY0121A suitable as an everyday watch?
Yes for office and evening wear if you accept 50 m water resistance. Dual-curve SAR sapphire is tougher than mineral, but this is still a leather-strap moon-phase dress watch, not a 100 m Contemporary Standard.
Where can I buy the Orient Star RE-AY0121A in Australia?
This page is the Chronospride listing for authentic RE-AY0121A stock. We inspect before dispatch. Covered by Chronospride’s 12 months warranty, handled by our team — see the authenticity and warranty page.
| Case-Size | 41mm |
|---|---|
| Band-Width | 20mm |
| Lug-Width | 20mm |
| Lug to lug size | 49mm |
| Case Thickness | 13.8mm |
