Grand Seiko · Mechanical

Strap for Automatic Date Stainless Steel / Black / Bracelet

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

Lug width20 mm
Case diameter37 mm
ReferenceSBGR253
FamilyMechanical
MovementGrand Seiko caliber 9S65 Hours, Minutes, Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the Mechanical SBGR253

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Mechanical SBGR253, seen from the bench

The Grand Seiko SBGR253 is a mechanical timepiece from the Mechanical family, featuring a 37 mm stainless steel case and the automatic caliber 9S65 movement. Certified for precision between -3 and +3 seconds per day, the 9S65 incorporates hand-finishing and component selection beyond industrial standards. The case employs Zaratsu polishing technique on all surfaces, creating mirror-like finishes. The dial includes a date window and is finished with sunburst decoration on the plates visible through the transparent caseback. The watch has a 20 mm lug width.

Frequently asked questions

What is the lug width of the Grand Seiko Mechanical SBGR253?

The Grand Seiko SBGR253 features a lug width of 20 millimetres. This measurement was specifically engineered to proportion the strap correctly to the 37mm case, maintaining the aesthetic and functional balance characteristic of Grand Seiko's Mechanical models. All straps compatible with this lug width will fit the case terminals perfectly.

What is the best strap for the Grand Seiko Mechanical SBGR253?

The best strap depends on your intended use and personal preferences. Black alligator with natural stitching creates formal elegance and striking contrast with the Zaratsu-finished case. Burgundy shell cordovan develops an exceptionally rich patina over time. Vegetable-tanned calf leather maintains the watch's constructive simplicity. A navy NATO strap offers versatile sportiness. FKM rubber is ideal for intensive daily wear. All are available in 20mm sizing.

How do you change the strap on a Grand Seiko SBGR253?

To change the strap, remove the spring bars—small pressure-loaded pins connecting the strap to the case lugs. Use a dedicated spring bar removal tool: position the tip beneath the spring bar's centre point and gently push downward until the end disengages from its seat. Once freed on both sides, the old strap slides away. Insert the new spring bars into the strap (or retain your original ones), align the holes with the case lugs, and reinsertion the spring bars by pressing firmly until they click into place. Verify both bars are securely seated before wearing.

Is an aftermarket strap compatible with the Grand Seiko SBGR253?

Yes, any strap manufactured for a 20-millimetre lug width is compatible with the SBGR253. Regardless of brand, material—leather, rubber, or fabric—or style, the sole requirement is that the spring bar holes are precisely 20mm apart. We recommend artisanally crafted straps that respect this exact measurement and employ durable materials with refined finishing, to preserve your watch's character.

How long does a leather strap last on a Grand Seiko SBGR253?

A leather strap's longevity depends on material quality, usage patterns, and care. A vegetable-tanned alligator strap, well maintained, lasts 5–7 years of daily wear. Shell cordovan, owing to its density, may serve 7–10 years. Standard calf lasts 3–5 years. Direct sunlight exposure, perspiration, and extreme humidity reduce this lifespan. An FKM rubber strap typically lasts 8–12 years. To extend strap life, rotate between multiple straps, clean regularly, and protect from extreme moisture. An artisanally crafted strap, finished completely, ages more gracefully than industrially produced alternatives.

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.

Request an appointment →

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