The Horological Brothers are proud of their heritage as well as the nation they call home, the Netherlands. Inspired by the Dutch 'Delta Works,' Bart and Tim have conceived their first sports utility watch, the aptly named 1969 DeltaWorks which also references the year Bart was born.

Build your own 1969 DeltaWorks
Dial Options: Khaki, Salmon, Black
Rubber Strap Options: Olive, Blue, Orange, Black, White
Inserts: Rubber clad or Stainless steel

Please contact Jeremy@osterjewelers.com or call 303.572.1111 to reserve your 1969 DeltaWorks today.

When designing this watch, Bart & Tim wanted to produce a model that indulged purists with a remarkable choice of colors and styles. The 1969 DeltaWorks is available with three different dial designs/colors., 5 different strap options and finally, a choice of stainless steel inserts or color-coordinated FKM rubber-clad inserts. The model is designed to cope with the perils of water ingress and shocks while still upholding the elevated standards of horology and traditional craftsmanship that are synonymous with the Grönefeld name.

TECHNICAL SPECIFICATIONS
Caliber
G-06
Movement dimensions
- Diameter: 32 mm
- Thickness: 5.5 mm
Number of parts
231
Power reserve
56 hours
Number of jewels
31 jewels, partially set in solid gold chatons.
Automatic system
- Uni-directional winding mechanism
- For 24 hours of autonomy 633 rotations of the Oscillating mass are required
Oscillating mass
- Entirely decorated by hand
- 18k solid gold segment
- Stainless steel center pivoted on a high precision ceramic ball to avoid excessive wear. To prevent damage to the movement and winding mass the extremities of the 4 arms are extended and guided by the case and case-back.
Balance wheel
Variable-inertia balance wheel with four white gold timing screws (diameter 10mm)
Frequency
21,600 vibrations/hour
Balance spring
Free sprung with triangle hairspring stud
Escapement
Jewelled Swiss lever
Main plate
Spotted & ruthenium electroplated brass main plate
Bridges
- Stainless steel, bevels polished by hand, micro-blasted center
- Circular grain on the top to highlight the bridges shapes and relief engravings
Displays
- Central hours and minutes
- Small seconds at 6 o'clock
Number of components
68 parts
Dimensions
- 44.5mm (Diameter including case inserts)
- 43.3mm (Diameter bezel)
- 12.5mm (Thickness)
- 53mm (Lug-to-lug)
Water resistance
10 ATM / 100 meters (330 feet)
Material
Stainless steel AISI 316L (1.4435)
Crown
- Screw down crown
- Triple gaskets with upright logo
Hands
- Flame-blued or polished steel extended Lancette hands with blue light emitting SuperLumiNova® Grade X1
- Small poised seconds hand
Strap
- Integrated FKM rubber strap available in black, olive, blue, white, or orange
- 20mm-18mm
Clasp
- Stainless steel 316L micro adjustable (7 increments over 9mm)
- Embossed Grönefeld and logo engraving
- Open must be done by operating both push buttons at once
Crystals
- Domed sapphire crystal on the front with hard anti-reflective coating on both sides.
- Flat sapphire crystal on the back with hard anti-reflective coating on both sides
Total weight
Stainless Steel 135 Grams

Oster Jewelers is an Authorized Grönefeld Retailer

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