Founded in the 1890s to standardize timekeeping across the American railroad system, Ball Watch Company has long been synonymous with precision and durability. The Engineer II series captures this heritage in a contemporary form, and the Moon Calendar model exemplifies the brand’s knack for fusing technical innovation with elegant design.

This reference NM3016C-S1J-SL is powered by the automatic caliber BALL RR1807, offering a sweeping central seconds hand and dual-register calendar display: a moon phase at 6 o’clock and a day/date indicator at 12. The silver sunray dial, paired with applied indices and dauphine hands, evokes understated sophistication. Yet, true to Ball’s identity, the watch is fitted with 30 tritium gas tubes—providing unmatched low-light legibility without requiring exposure to light.

A domed sapphire crystal with anti-reflective coating ensures excellent visibility, while the screw-down crown and 100m water resistance add daily-wear resilience. The polished and brushed stainless steel bracelet integrates seamlessly into the lugs, offering both comfort and structural integrity.

Condition Report

Overall Condition:
Like new and unworn. This watch remains in pristine showroom condition, having only been sized or worn on the wrist for a short time.

Case:
Flawless stainless steel case with no surface scratches, nicks, or signs of handling. Brushed and polished finishes are crisp and intact.

Bezel:
Unmarked and perfect, with factory polish showing no signs of wear.

Crystal:
Domed sapphire is immaculate with no scratches, scuffs, or hairlines. Anti-reflective coating is clear and undamaged.

Dial & Hands:
Mint. The silver dial is bright and clean; all applied markers, moon phase, and calendar functions are perfectly aligned and fully functional. Lume is fully active and evenly glowing.

Bracelet & Clasp:
Factory condition with all links included. No desk diving marks, stretch, or clasp wear. The bracelet has not been sized or adjusted.

Movement:
Running within manufacturer’s tolerances. All complications (moon phase, day/date) function smoothly via the crown. No service required.

What’s Included

• Warranty booklet

• Ball international warranty card (dated 2025)

• Original Ball hang tag

• Full stainless steel bracelet with all removable links

  
  

Collector’s Notes

The Ball Engineer II Moon Calendar is a hidden gem within the world of Swiss watchmaking. It merges the romanticism of a moon phase complication with Ball's unmistakable DNA: rugged build quality, superior low-light legibility, and high-value engineering. The use of tritium gas tubes gives this watch a technical advantage over traditional lume, while its classically styled case and dial keep it firmly within the aesthetic realm of a refined daily wear piece.

For collectors seeking a moon phase watch that doesn’t sacrifice durability or function, the NM3016C-S1J-SL stands apart. It’s especially appealing to those who admire brands like Sinn, Tudor, or Fortis but desire something a little more poetic—with real Swiss mechanical chops and a rich horological story.