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Grand Seiko · Mechanical

Strap for Automatic Hi Beat 36000 Titanium/ White / Bracelet

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 Grand Seiko
Lug width20 mm
Case diameter40 mm
ReferenceSBGH243
FamilyMechanical
MovementGrand Seiko caliber 9S85 hours, minutes, seconds | date
Year2017
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 Mechanical SBGH243

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Mechanical SBGH243, seen from the bench

The Grand Seiko Mechanical reference SBGH243 is equipped with the automatic caliber 9S85 with hour, minute, second and date indication. The movement offers a power reserve of 55 hours and a frequency of 36,000 vibrations per hour. The case features a stainless steel construction with Zaratsu polishing for the surface finishing.

Frequently asked questions

What is the lug width of the Grand Seiko Mechanical SBGH243?

The Grand Seiko SBGH243 features a <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 20 millimetres. This measurement allows seamless integration with premium aftermarket straps, significantly expanding customisation options beyond the original titanium bracelet. The 20mm standard is widely available across the watchstrap market, ensuring both stock and bespoke options.

Which strap materials pair best with the Grand Seiko SBGH243?

<a href="/pages/termine-glossario/alligatore">Alligator leather</a> stands as the natural choice, as its geometric texture harmonises with the precision-engineered titanium case. Alternatively, vegetable-tanned calf leather offers progressive patination that enhances the case's titanium finish over time. For sportier interpretations, <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> mounted on a brushed-steel <a href="/pages/termine-glossario/deployante">deployment clasp</a> creates refined contrast.

How do I change the strap on a Grand Seiko SBGH243?

Strap removal involves extracting the lug pins using a dedicated spring bar tool, applied with sufficient pressure to avoid damaging the titanium case. This operation is best performed by a qualified watchmaker or at the Casati Milano atelier, which provides installation and <a href="/pages/termine-glossario/misura-ansa">lug width</a> adjustment tailored to your wrist anatomy.

Which aftermarket straps are compatible with the Grand Seiko SBGH243?

All straps with a 20mm <a href="/pages/termine-glossario/misura-ansa">lug width</a> are compatible with this model. Milano Straps offers a curated selection of premium leather, technical rubber and NATO fabric options, each finished with artisanal standards that respect the case's minimalist aesthetic. Customisation includes sizing, monogramming and thread colour selection.

What is the lifespan of a leather strap on a Grand Seiko SBGH243?

A premium leather strap, particularly vegetable-tanned hide, remains fully functional for 3-5 years under daily wear, whilst developing a natural patina characteristic of the material. Casati Milano straps benefit from an 18-month guarantee and can be serviced or replaced at the atelier. Longevity depends on deployment clasp wear and exposure to harsh climatic conditions.

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