The Longines HydroConquest Ref. L3.788.4.90.6 combines contemporary Swiss dive-watch design with a striking blue and black color combination, commonly nicknamed the "Cookie Monster" by watch enthusiasts.

Featuring a 42mm stainless steel case, black dial, and blue ceramic unidirectional rotating bezel, the watch offers a sporty yet refined appearance. Its stainless steel Milanese mesh bracelet provides a distinctive alternative to traditional steel bracelets, complementing the HydroConquest's modern design.

Powered by a Longines automatic movement with approximately 72 hours of power reserve, the watch features a sapphire crystal and 300-meter water resistance, making it suitable for everyday wear and recreational diving.

This 2026 example is offered brand new in box and comes as a complete full set.

Brand: Longines
Collection: HydroConquest
Model: HydroConquest 42mm "Cookie Monster"
Reference: L3.788.4.90.6 / L37884906
Year: 2026
Case Size: 42mm
Case Material: Stainless Steel
Dial: Black
Bezel: Blue Ceramic, Unidirectional Rotating
Movement: Longines Automatic
Power Reserve: Approximately 72 Hours
Crystal: Sapphire
Water Resistance: 300 Meters
Bracelet: Stainless Steel Milanese Mesh
Includes: Full Set
Condition: Brand New in Box (BNIB).