Blue is the color most people end up wearing every day, and on the Spirit Zulu Time 39mm it is a sunray blue that glows bright in daylight and turns deep navy indoors. Paired with a leather strap, reference L3.802.4.93.2 is the most relaxed and approachable member of the Zulu Time family.

That easygoing look hides a serious instrument. Longines made its first dual-time-zone watch in 1925, and this collection takes its name from "Zulu," the radio code for universal time used in aviation. The automatic caliber L844.4 is COSC-certified, equipped with a silicon balance spring, and offers about 72 hours of reserve, so it can sit on a dresser over a weekend and still be running on Monday. Its jumping local hour hand makes crossing time zones simple.

The matching blue ceramic bezel ties the dial together, and the 39mm case wears comfortably on slimmer wrists. With the quick-release system you can change the strap without tools, which makes it an easy watch to adapt for summer or a dressier evening.

Blue Spirit Zulu Time 39mm, L3.802.4.93.2

• Steel case, 39mm diameter, 13.5mm height
• Sunray blue dial with applied luminous numerals and date
• Blue ceramic bidirectional GMT bezel
• Calibre L844.4, automatic chronometer with independent hour hand
• Approximately 72 hours of power reserve
• Sapphire crystal, screw-down crown
• Water-resistant to 100m
• Leather strap, folding clasp with micro-adjustment

Bright, friendly and fully capable, this is the Zulu Time that suits almost every wardrobe.