Junkers calls this watch the 1st Atlantic Flight Dual Time Big Date 6440-1. That’s a mouthful. The crown at 3:00 is for setting the main time and date. The crown at 4:00 can control the dual time subdial for GMT functionality (keeping time in two time zones).

Detailed Specs:

• Reference: 6440-1
• Movement: Quartz
• Caliber: Ronda 6203.B
• Case: Stainless steel
• Diameter: 42mm
• Thickness: ~10mm
• Lug-to-Lug: ~51mm
• Dial: silver
• Crystal: Mineral
• Band: Black Junkers leather strap
• Lug-Width: 22mm
• Water Resistant up to 50m/165ft
• Retail Price: NA, Discontinued

What’s Included? Junkers box, manual (signed and dated 2014), caliber booklet, original tag.

Condition: Excellent overall. Was part of a huge collection and saw minimal wrist time. New battery installed!