Upgraded Sea-Gull 818.904 automatic tourbillon watch, retrograde date and weekday
Upgraded Sea-Gull 818.904 automatic tourbillon watch, retrograde date and weekday

Upgraded Sea-Gull 818.904 automatic tourbillon watch, retrograde date and weekday

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Your Price: $850.00
Part Number: W-M171STourbillon
Availability: In Stock
Diameter without crown: 42mm
Thickness: 12mm
Lug width: 22mm
Weight: 109 grams
Movement: Sea-Gull ST8004ZS tourbillon automatic
Sea-Gull M171S is well-known for its flying wheel, why not upgrade it to a real tourbillon mechanism? Your dream comes true if adding $650 on top of an ordinary M171S automatic. You will be a proud owner of this automatic tourbillon with retrograde date and weekday.   

The crown is decorated with a blue gem, which is another upgraded feature deserves compliment. 

Free airmail shipping is included. Questions? Feel free to send me a message. Your satisfaction is very important at this time and many times in the future.

The reversal of time becomes reality

Retrograde mechanism refers to jumping back to the starting point after having reached the end, making its movement a reciprocating motion different from the common circular motion.

Traditional watches always move in a circle around the center point. As early as 1794 Abraham-Louis Breguet made a pocket watch with retrograde date display. E. Koehn exhibited his own retrograde second hand patent in 1892. Ever since 1903 when Giovanni Sgherlino registered retrograde hour and minute hand patent in Switzerland, retrograde has diversified into a variety of functions.


The retrograde mechanism researched and developed by Seagull Watch Company was awarded China National Patent in 2005. Sea-Gull retrograde watch series not only have contributed innovative ideas to the retrograde technology, but also provided new products for watch fans who are fond of retrograde features.

Sea-Gull M171S automatic flying wheel watch is a popular model, attributable to the following three success factors.

1) Highlight practical functions. Besides hour, minute and second, there is a retrograde date window at 10 o’clock. The other retrograde weekday window is at 2 o’clock.


2) The mechanical movement is demonstrated in front of eyes. At 6 o’clock is a hollowly-designed framework, within which a balance wheel is running non-stop to add mechanical dynamics.


3) For watches with double retrograde windows, a tiny error in dial layout will affect the overall visual effect. The success of this watch’s creative and clean dial design lies in the perfect reflection of symmetrical aesthetics. Although there are five hands on one dial, the readings of all parameters are not affected at any given time. The unique formation of two fan-shaped retrograde windows, blue hands in contrast with silver grey white dial, echoing with the flying wheel, signify the soul of M171S.


The swinging back of pointers is indeed the reversal of time!

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