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Ball Watch · Engineer Master II

Strap for Ball Watch Engineer Master II NM3500C-S4-BK

The Ball Watch Engineer Master II NM3500C-S4-BK takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

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  • Ships in 1–3 working days
  • Worldwide shipping
  • 30-day returns
  • 12-month warranty on manufacturing defects
  • Hand-stitched in Milan

Lug width

22mm
22 mm strapsAll Ball Watch
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Lug width22 mm
ReferenceNM3500C-S4-BK
FamilyEngineer Master II

Spring bar

Swiss Standard universal spring bars

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

Standard spring bar · length 22 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Ball Watch Engineer Master II NM3500C-S4-BK — watch

Straps for the Engineer Master II NM3500C-S4-BK

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

What length do I need?

Measure your wrist with a tailor's tape or a piece of string, comfortably snug.

Wrist circumferenceLength (long side / short side)
15.0–16.4 cm120 / 70 mm
16.5–17.8 cm125 / 75 mm
17.9–19.0 cm130 / 80 mm
19.1–20.3 cm135 / 85 mm
20.4–21.6 cm140 / 85 mm
21.7–22.9 cm145 / 90 mm

The ready-to-wear strap is 115 × 75 mm. For a smaller or larger wrist I make it in the right length: order your length.

What I'm asked about the Ball Watch Engineer Master II NM3500C-S4-BK

What strap size does the Ball Watch Engineer Master II NM3500C-S4-BK take?

The Ball Watch Engineer Master II NM3500C-S4-BK needs 22 mm between the lugs, usually 18 or 20 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the Ball Watch Engineer Master II NM3500C-S4-BK be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the Ball Watch Engineer Master II NM3500C-S4-BK?

Yes, in 22 mm leather. On a case a calf strap works every day; if you want something more, alligator.

Which strap do you recommend for the Ball Watch Engineer Master II NM3500C-S4-BK?

A 22 mm calf strap, for every day. You'll find it ready in the 22 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

For changing the strap

Classic Strap and Bracelet Removal Tooltwo-tip spring bar tool→Milano Straps Premium Swiss Standard Watch Bucklestang buckle, steel or PVD→Leather Conditioner Milano Strapsnourishes and protects the strap→Casati Milano Rectangular Epsom Leather Travel Case — Brownfor the watch and spare straps→

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

The atelier's website: casatimilano.com

Updated on · by Antonio Zichichi