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Hamilton · Intra-Matic

Strap for Intra-Matic 68 Auto Chrono Stainless Steel / Black / Strap

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

22mm
22 mm strapsAll Hamilton
Lug width22 mm
Case diameter42 mm
ReferenceH38716731
FamilyIntra-Matic
MovementHamilton caliber H-31 hours, minutes, small seconds | date | Chronograph
Year2017
CaseStainless Steel

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 Intra-Matic H38716731

Selected for the 22 mm lug width · workshop selection

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The Intra-Matic H38716731, seen from the bench

The Hamilton Intra-Matic H38716731 is an automatic chronograph with H-31 movement, featuring a 42 mm stainless steel cushion case with brushed finish and sapphire crystal. Introduced in 1968, this model reinterprets the original Intra-Matic collection through modern design philosophy. The 22 mm lug width accommodates leather, NATO, rubber, or technical fabric straps and represents the ideal proportion for this case diameter and construction.

Frequently asked questions

What is the exact lug width of the Hamilton Intra-Matic H38716731?

The lug width of the Hamilton Intra-Matic H38716731 is 22 millimetres. This dimension is standard for 42mm cushion-case watches of this configuration. To verify correctly, insert a digital calliper or ruler into the internal space between the two case lugs, measuring from one to the other internal contact point of the spring bars.

Which strap should I pair with the Hamilton Intra-Matic H38716731?

The ideal strap for this model is leather in vegetable-tanned Tuscan hide with caramel or honey-aged patina. This choice is philologically coherent with the orologio's vintage-contemporary aesthetic and ensures natural colour evolution over time. Valid alternatives include honey-red shell cordovan for superior rigidity, heavy cotton NATO for versatility, or artisanal vulcanised rubber for a technical approach.

How do I change the strap on my Hamilton Intra-Matic H38716731?

Strap replacement is a straightforward operation if you possess the correct tools. Obtain a spring bar tool or a small flat-blade screwdriver. Invert the watch, locate the spring bar on one side of the case (a small metallic protrusion), gently press downward with the tool to release the spring, then extract the strap attachment. Repeat on the opposite side. Insert the lugs of the new strap into the attachments until they click firmly into position.

Can I use an aftermarket 22mm strap on this watch?

Yes, any strap with a 22mm lug width is compatible with the H38716731. Our artisanal straps are manufactured to this specification and fitted according to correct tolerances. Always verify that the strap features compatible thicknesses (typically 1.6–2.2 millimetres) and that the spring bar seats are slightly convex to fit perfectly into the case spring mechanisms.

How long does a leather strap last on a watch like this?

The longevity of a leather strap depends upon usage and tanning method employed. High-quality leather, such as vegetable-tanned Tuscan hide, maintains structural integrity for 5–8 years of regular daily wear. Vegetally-tanned leather is more durable than chrome-tanned varieties and ages elegantly. Deterioration begins with loss of suppleness and the emergence of micro-fractures in the outer epidermis. Protect it from excessive moisture and prolonged perspiration; if exposed to rain, allow natural air-drying away from heat sources.

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