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Sinn · Instrument Chronographs

Strap for Pilot Chronograph 103 Ti IFR

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

Lug width

20mm
20 mm strapsAll Sinn
Lug width20 mm
Case diameter41 mm
Reference103.0793
FamilyInstrument Chronographs
MovementETA caliber 7750 hours, minutes, small seconds | date, day | Chronograph
CaseTitanium

Spring bar

Swiss Standard universal spring bars

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

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Straps for the Instrument Chronographs 103.0793

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Instrument Chronographs 103.0793, seen from the bench

The Sinn 103.0793 Pilot Chronograph exemplifies German instrument-watch engineering for professionals—pilots, engineers, and precision timekeepers. The 41mm titanium case houses an ETA 7750 column-wheel chronograph movement, delivering proven reliability. The black dial displays hours, minutes, subdial seconds, date, day, and complete chronograph functions with severe, legible design. The 20mm lug width is non-standard, precisely calculated by Sinn to balance the 41mm case diameter and wrist presence. Titanium resists oxidation and patina while reducing weight without compromising strength. This is mechanical chronometry without ornamentation—a professional instrument, not jewelry.

Frequently asked questions

What is the exact lug width of the Sinn 103.0793?

The lug width of the Sinn 103.0793 is precisely 20mm. This dimension is non-standard, so it is essential to verify compatibility before purchasing an aftermarket strap. Use a calliper to measure the distance between the two lugs on the case: it must be exactly 20mm.

Which strap is most suitable for the Sinn Instrument Chronographs 103.0793?

The choice depends on intended use and personal style. For formal elegance, a dark brown or black alligator or calf leather strap. For tactical function and instrument-grade purpose, a NATO strap in grey, navy or black. For aquatic or industrial environments, a robust FKM rubber. The black titanium case pairs excellently with any well-crafted material.

How do I change the strap on the Sinn 103.0793?

Use a spring bar tool to gently push the inward-facing lug pin toward the centre of the case. The pin will retract, allowing the old strap to be removed. Position the new strap with its lug over the pin, then release the tool: the pin will return to its locked position. Work methodically to avoid scratching the titanium case.

Can I use an aftermarket strap on this Sinn model?

Yes, provided the lug width is precisely 20mm. Milano Straps offers a curated collection of artisanal straps in leather, NATO fabric and rubber, specifically crafted for this dimension. Always verify lug measurements before purchase to ensure compatibility.

What is the lifespan of a leather strap on a chronograph like the 103.0793?

A quality leather strap—such as those from Milano Straps—will typically last 5–7 years under daily wear. Leather naturally develops character and darkens with patina. With regular care (gentle cleaning and occasional conditioning), longevity extends considerably. Rubber, conversely, withstands humid and marine environments longer, maintaining elasticity for 8–10 years before degradation.

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