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The "Extra Flat" model is a masterpiece among the Santos-Dumont series.
Equipped with the Frederic Piguet Cal.21, it is a popular model among enthusiasts.
The Swiss dial with guilloche is relatively rare, and this particular model is in excellent condition, with the dial being particularly well-preserved and highly recommended.
The CPCP Santos Extra Flat model from the 2000s was based on this model, with almost identical size and construction.
The differences are that, while both use the Cal.21, this model's movement has no decoration, and its dial's guilloche is more deeply engraved, creating a more emphasized design.
While both are a matter of preference, if you wish to enjoy the beautiful guilloche characteristic of this era, this would undoubtedly be the one.
The overall condition is excellent, suggesting it was kept in a remarkably good environment considering its age.
The dial is completely free of dirt, cracks, or discoloration, which is quite rare for guilloche.
There are no visible scratches on the glass or other parts.
The case has had almost no polishing. There are light, minor scratches on the case and bezel, but they are insignificant.
The edges are sharp and well-defined. The original case condition has been maintained, and it is in beautiful shape.
《Product Details》
Brand Name: Cartier
Product Name: Santos-Dumont LM Extra Flat
Movement: Manual winding
Caliber: Cal.21 Frederic Piguet
Material: K18YG
Model Number: 8210
Serial: 821*******
Color: Silver, Gold
Case Diameter: Approximately 27mm (width) x 36mm (height), bracelet up to 17.5cm
Buckle: 18kYG genuine
Strap: New aftermarket
Accessories: Our warranty card
This item will be delivered after an overhaul (please allow approximately one month).
We also provide maintenance services after your purchase.
~Product Rank~
【A】Shows slight signs of age but no noticeable major flaws.
【B】Has a certain degree of noticeable scratches/stains.
【C】Has significant scratches/stains.
【D】Has problems with usability.
*The rank is solely based on our subjective assessment.
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Things to Confirm Before Purchase
If you would like the bracelet-style wrist size adjusted, please contact us in advance. Additional links may be purchased for an extra fee, subject to availability.
As these are vintage items, care instructions vary by product. If you have any questions, please contact us individually.
This is an important purchase for you.
Please check our Frequently Asked Questions page.
Including shipping and insurance: 38,000 (JPY) Additional customs duties may apply. Please check the additional charges in advance before placing your order. Under Japanese law, crocodile exotic leather cannot be shipped. We can change it to cowhide for shipping. Please contact us for details.
ANTEの安心サポート
We carefully select and service each watch to ensure that you can use it with as much peace of mind as possible.
However, precisely because these watches have stood the test of time, they also have characteristics that differ from those of modern new watches.
We hope you will enjoy these qualities as well.
Because these vintage pieces have been treasured and passed down over the years, we carefully inspect their interiors and verify their authenticity.
We ship items domestically and internationally.
Once your order has been shipped, you will receive a tracking number.
First-time online shoppers can use our service with confidence.
In Tokyo’s Ginza district, you can view the items you’re considering in person.
Ante excels at providing consultations and guidance tailored to each customer’s individual needs. Please feel free to contact us about the situations in which you plan to use the product or any concerns you may have when making your purchase. We are happy to answer a wide range of questions, including the product’s benefits and points to note.




