Moritz Grossmann · Atum

Strap for Atum Date White Gold

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter41 mm
ReferenceMG-000857
FamilyAtum
MovementMoritz Grossmann caliber 100.3 Hours, Minutes, Small Seconds | Date | Power Reserve Indicator
CaseWhite Gold

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Atum MG-000857

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Atum MG-000857, seen from the bench

The Moritz Grossmann Atum features the in-house caliber 100.3 with hours, minutes, small seconds, date and power reserve. The movement offers essential functions with the brand's typical German finishing. The reference MG-000857 presents a classic layout with a three-hand dial and auxiliary complications.

Frequently asked questions

What is the lug width of the Moritz Grossmann Atum MG-000857?

The lug width (strap width) of the Moritz Grossmann Atum MG-000857 is 20 millimetres. This measurement refers to the distance between the two spring bar attachment points on the case. At milanostraps.it you will find a wide range of artisanal straps compatible with this specific size.

Which strap is most suitable for the Moritz Grossmann Atum MG-000857?

The MG-000857 in 18-carat white gold pairs beautifully with alligator straps in neutral tones (sand brown, taupe grey) or shell cordovan, which develop a fascinating patina over time. For a sportier approach, black or grey NATO straps enhance the German engineering purity. Rubber straps represent the ideal choice for casual daily wear whilst maintaining elegance and dignity.

How do I change the strap on the Moritz Grossmann Atum MG-000857?

To change the strap, you will need a spring bar removal tool. Position the watch with the case facing down, locate the small lateral holes below the lugs, and insert the tool to compress the spring bar. Remove the old strap first, then insert the new one by aligning it with the bars and allowing the spring to reposition naturally. If you are not experienced, a watchmaker can perform this operation within minutes.

Can I use aftermarket straps on the Moritz Grossmann Atum MG-000857?

Absolutely yes. The 20mm lug width is a standard size used by many luxury watches. Quality artisanal aftermarket straps offer the opportunity to personalise your MG-000857 according to your aesthetic taste and usage needs, from formal alligator models to sporty NATO or rubber options.

How long does a leather strap last on the Moritz Grossmann Atum MG-000857?

The durability of a leather strap depends on material quality, frequency of use, and climatic conditions. A high-quality artisanal alligator or shell cordovan strap can last 3-7 years with regular use, given that the leather naturally develops a fascinating patina over time. A classic calf leather strap has similar longevity. Protect the strap from excessive moisture and prolonged direct sun exposure to maximise its life.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only