Cartier Ballon Bleu 40mm WSBB0040

The Cartier Ballon Bleu 40mm WSBB0040 is a modern classic that blends elegant design with everyday versatility, defined by its signature rounded “balloon” case and instantly recognizable blue cabochon crown. Crafted in stainless steel, it features a silvered guilloché dial with Roman numerals, blued-steel sword hands, and a sapphire crystal—delivering that unmistakable Cartier aesthetic that feels both timeless and slightly elevated over traditional sport watches. Powered by the automatic caliber 1847 MC, it offers reliable performance with a date complication and refined finishing.

At 40mm, the WSBB0040 sits in the sweet spot—large enough for modern wrists but still elegant, making it one of the most wearable pieces in Cartier’s lineup. The curved case profile, integrated crown guard, and polished bracelet give it a smooth, almost jewelry-like presence, while still functioning as a daily watch with 30m water resistance.

If you want, I can stack this against something like a Santos or Datejust—this one lives in a very specific lane and doesn’t really compete the way people think.

Reference: WSBB0040

Dated: 2025

Bracelet: Stainless Steel

Case Size: 40mm - Stainless Steel

Functions: Hours, minutes, seconds, Date

Accessories: Inner/outer boxes, and warranty card

Crystal: Sapphire

Bracelet size: 7.25”

Movement: 1847 - Automatic

Case has little to no wear. Bracelet has little to no wear. Dial, hands, and crystal have no wear.

Cartier, founded in Paris in 1847 by Louis-François Cartier, began as a jewelry workshop that quickly gained recognition among French aristocracy. Under the leadership of Alfred Cartier, the company expanded into watchmaking, with a pivotal moment occurring in 1904 when Louis Cartier created the Santos Dumont, the world's first modern men's wristwatch, for aviation pioneer Alberto Santos-Dumont.

Throughout the 20th century, Cartier continued to innovate in watch design, introducing iconic timepieces like the Tank in 1918, inspired by the Renault FT-17 tank. The company's watches became known for blending functionality with artistic elements, incorporating Art Deco influences and precious materials. Today, as part of the Richemont Group, Cartier remains a leader in luxury watchmaking, continuing to produce exquisite timepieces that combine tradition with contemporary design, from the classic Tank to the modern Pasha.