Cartier Ballon Bleu Moonphase WSBB0020 37mm

Overview

For sale is a 2018 Cartier Ballon Bleu Moonphase (Ref. WSBB0020)—a graceful expression of Cartier’s timeless aesthetic and mechanical sophistication. This elegant watch is in very good condition, showing minimal signs of wear, and comes complete with its original box and card. The current leather strap shows light wear but is accompanied by a brand new OEM replacement strap for convenience and versatility.

Key Features

• Model: Cartier Ballon Bleu Moonphase

• Reference Number: WSBB0020

• Year: 2018

• Case Size: 37 mm

• Case Material: Stainless Steel

• Bezel: Smooth polished steel

• Dial: Silvered guilloché with Roman numerals and moonphase at 9 o’clock

• Crystal: Sapphire with anti-reflective coating

• Crown: Fluted crown set with a blue cabochon-shaped synthetic spinel

• Strap: Black or blue alligator leather strap with deployant clasp; includes brand new OEM leather strap

• Water Resistance: 30 meters (3 bar)

• Movement: Cartier in-house caliber 080 MC (automatic, 42-hour power reserve)

• Functions: Central hours and minutes, moonphase indication

• Condition: Very good with minor wear on strap; includes brand new OEM strap

• Included: Original box, warranty card, and extra OEM strap

Detailed Description

The Cartier Ballon Bleu Moonphase WSBB0020 strikes a perfect balance between poetic charm and horological precision. Housed in a smooth 37mm stainless steel case, its softly rounded profile and distinctive integrated crown guard instantly identify it as part of Cartier’s celebrated Ballon Bleu collection. The signature fluted crown, topped by a blue cabochon spinel, lends an unmistakable touch of artistry.

The silvered guilloché dial is adorned with bold Roman numerals, classic blued-steel sword hands, and a beautifully executed moonphase indicator at 9 o’clock—highlighting Cartier’s mastery of blending form and function. Its harmonious design captures both the brand’s Art Deco roots and its contemporary flair.​

Inside beats the Cartier in-house automatic caliber 080 MC, known for its durability and precision. With a 42-hour power reserve and smooth self-winding action, this movement ensures reliability worthy of the maison’s legacy. The sapphire caseback provides an elegant glimpse of its mechanical heart.

Historical Significance

Cartier launched the Ballon Bleu de Cartier in 2007 to showcase its softer, more rounded aesthetic. It quickly became one of Cartier’s best-selling models, recognized for its combination of modern comfort and classical elegance. The Moonphase variant—ref. WSBB0020—adds a poetic layer to the Ballon Bleu’s charm, representing not just the passage of time but its celestial rhythms. The watch’s 37mm case makes it a versatile unisex option, carrying both wrist presence and understated grace.​

Condition and Extras

This 2018 example is in very good condition, showing minimal wear on the case and clasp. The original strap is lightly worn, but a brand new OEM Cartier strap is included for fresh use.
Comes with:

• Original Cartier box

• Warranty card

• New OEM strap

Price and Shipping

This Cartier Ballon Bleu Moonphase is offered at a competitive price, with fully insured overnight shipping within the US included for peace of mind.

Contact

Please feel free to reach out with any questions or to request additional pictures. This is a refined opportunity to own one of Cartier’s most elegant moonphase timepieces—the Ballon Bleu—complete with its original packaging and an additional OEM strap for timeless versatility.

This description presents a professional, collector-grade overview emphasizing the Cartier Ballon Bleu Moonphase’s craftsmanship, history, and pristine 2018 condition.