G-Shock Debuts a New Definitive “CasiOak,” Now with Even Stronger Royal-Oak Styling

The 2100 Series lives up to its luxury-leaning nickname with a downright stunning new dial treatment.

Close-up of a silver metal wristwatch with a black dial and "MR-G" engraved on the crown.

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By Jack Seemer

Published January 13, 2026

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Like many iconic timepieces, the G-Shock 2100 Series watch goes instead by a clever nickname.

The so-called “CasiOak” is widely considered the brand’s most refined design to date, thanks in no small part to its striking similarity to the Audemars Piguet Royal Oak.

There’s the octagonal case. An integrated bracelet. Now it even has a textured dark-blue dial, akin to the most representative Royal Oak variants.

Close-up of a Casio G-Shock MR-G watch with a blue patterned dial, silver hour markers, and date display. — The MRG-B2100D-2A combines an octagonal case, integrated bracelet and dark-blue textured dial for the most convincing “CasioOak” to date.

The MRG-B2100D-2A is the latest entry into Casio’s high-end Mr-G lineup, and the closest thing collectors may ever get to its iconic namesake.

Naturally, Casio is coy about the two models’ connection.

According to the brand, the inspiration for this specific reference was an ancient pagoda in the Yamagata Prefecture (the region where Mr-G models are made).

Close-up of a Casio MR-G watch face with silver hour markers and hands on a textured dark blue background. — Casio credits an ancient pagoda in Japan as the source material for this specific reference.

It calls the dial color “hanada-iro,” a traditional Japanese blue grounded in the country’s deep ties to indigo-dying.

As for the specific texture, it matches the kigumi pattern of other Mr-G “CasioOaks,” separating it from the tapisserie dials found on the Royal Oak.

Silver Casio G-Shock MR-G wristwatch with a blue textured dial and metal bracelet. — The *kigumi* pattern differs from the famous tapisserie dials found on the Royal Oak.

Of course, there’s more to this watch than dashing good looks.

The case and bezel consist of nearly 30 separate components, with a titanium carbide coating for improved scratch resistance. Casio also opted for Cobarion and DAT55G, two high-performance alloys for the top bezel and bracelet, respectively.

Disassembled silver metal G-Shock watch case parts arranged on a black surface. — Nearly 30 components make up the case and bezel.

Brushed silver metal watch clasp with "MR-G" and "LOCK" engravings on a linked bracelet. — A special titanium alloy called DAT55G brings extra durability to the bracelet.

Availability and pricing

The MRG-B2100D-2A debuts in Japan this month with a price of 572,000 yen (nearly $3,600), with a stateside launch expected to follow.

Though expensive by G-Shock standards, the reference remains an affordable alternative to the Audemars Piguet Royal Oak. That watch starts north of $20,000, with many variants exceeding six figures.

Silver Casio G-Shock MR-G wristwatch with blue patterned dial and metal link band.

G-Shock MRG-B2100D-2A

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About the Author:

Jack Seemer is the executive editor at Gear Patrol, with over a decade of experience in product journalism. He currently reports on a wide range of topics, including footwear, watches, EDC, cookware and more.

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