2026-05-26
Best Watch Straps for the Casio Duro MDV106
Best Watch Straps for the Casio Duro MDV106
The Casio Duro MDV106 is the most discussed budget dive watch in the world — not the most technically impressive, not the most historically significant, but the one that the watch community returns to repeatedly as the definitive answer to the question "what is the best dive watch for under $50?" The answer is almost always the Duro.
The specification at this price is genuine: 200m ISO-certified water resistance, a unidirectional rotating bezel with a screw-down crown, mineral crystal, a sunburst-finish black dial with a red-tipped seconds hand, and Casio's reliable 2784 quartz module with hacking seconds for accurate time setting. The 44mm case with its brushed top surfaces and polished sides creates more visual sophistication than the price suggests. The Marlin logo — a diving marlin — is engraved on the caseback of all Casio dive watches rated at 200m or above. It is the brand's own quality signal.
The factory resin strap is the Duro's weakest element. Multiple reviewers describe it as rigid, overlong, and fitted with a plain polished buckle that has no markings or detail. The watch deserves better. And with a 22mm lug width — the most widely stocked width in the aftermarket — there is no shortage of options. WristyBizzle described the Duro as "a potential strap monster" for this reason. The collector community has confirmed this verdict through years of experimentation.
Casio Duro MDV106 Strap Size
The Casio Duro MDV106 uses 22mm watch straps lugs — confirmed by multiple independent reviews and owner measurements. 44mm case, 12mm thick, 49mm lug-to-lug.
MDV106-1AV (black dial, black case) — 22mm watch straps. MDV106-1A2V (black dial, blue bezel) — 22mm watch straps. MDV106B-1A2V (blue dial, blue bezel) — 22mm watch straps. All MDV106 variants — 22mm watch straps.
Note on 20mm confusion: Some sources incorrectly list the Duro as 20mm — this refers to the buckle width at the tapered end of the factory strap, not the lug width. The lug width is confirmed at 22mm by caliper measurement. Order 22mm watch straps.
What Casio Ships With — And Why It Gets Changed
Casio ships the Duro on a resin strap that is functional for diving but unremarkable for everyday wear. The strap is rigid, runs long, and has a plain polished buckle without markings. It is appropriate for the watch's diving brief — resin is waterproof and practical in the water — but almost every Duro owner upgrades the strap immediately.
The good news: 22mm is the most widely stocked strap width in the world. Every material, every colour, every construction is available. The Duro's 44mm black case is also one of the most strap-receptive in the budget category — the high-contrast black dial and polished/brushed case work with every strap colour without contradiction.
Best Rubber Straps for the Casio Duro MDV106
The Duro's 200m water resistance makes rubber the primary serious active strap. The factory resin is functional; FKM rubber is the upgrade.
Tropical style FKM in black at 22mm watch straps — the most celebrated Duro rubber combination. The vintage basket-weave and honeycomb surface patterns reference the 1960s professional dive watch culture that the Duro's design brief draws from. Black tropical FKM on the black dial creates a unified dark combination with depth and character that plain black rubber cannot match.
Brown tropical FKM at 22mm watch straps — for the most warm vintage character. Warm brown tropical on the black dial creates a temperature contrast that references aged professional diving equipment.
Classic FKM rubber in black at 22mm watch straps — the most practical active upgrade from the factory resin. Premium FKM is waterproof, chemical-resistant, and UV-stable.
Blue FKM rubber at 22mm watch straps — for the blue bezel variants (MDV106-1A2V, MDV106B-1A2V). Blue rubber on blue bezel creates a tonal coherence where the strap and bezel read as part of the same palette.
Orange FKM rubber at 22mm watch straps — for the boldest and most safety-colour-coherent active combination. Orange references the Duro's own red-tipped seconds hand and dive rescue colouring.
Best Nylon Straps for the Casio Duro MDV106
Single-pass nylon — Original at 22mm watch straps with the CNS solid buckle. The Duro's black case and dial work with every nylon colourway. Most recommended combinations:
- Black — the most minimal and most operationally unified. Monochrome Duro.
- Navy — for the blue bezel variants. Tonal coherence between bezel and strap.
- Olive / khaki — for the most field-diver operational character.
- Admiralty Grey — the most composed operational colourway.
- Black and grey — the most understated collector combination.
- Blue and black — for the blue bezel variant. Directly referencing the bezel colour on the strap.
Marine Nationale elastic at 22mm watch straps — the most comfortable Duro daily wear option. The professional military dive heritage connects directly to the Duro's own 200m specification. Navy Marine Nationale on the blue bezel Duro is the most coherent colour choice.
RAF single-pass nylon at 22mm watch straps — for the most specifically British military heritage combination.
Canvas at 22mm watch straps in olive — for a vintage expedition diver character.
Paratrooper elastic at 22mm watch straps — the most comfortable daily option.
Best Leather Straps for the Casio Duro MDV106
Leather on the Duro creates the most surprising transformation — the $50 dive watch becomes a compelling everyday sport-dress piece. The black dial's neutrality means leather reads as a deliberate style choice rather than a mismatch.
Leather watch straps in dark brown flat calfskin at 22mm watch straps — the most celebrated Duro leather combination. Warm brown against the black dial creates the warm-cool contrast that the collector community consistently identifies as the most rewarding budget dive watch leather pairing. The Duro's 12mm case thickness suits moderately padded leather well.
Leather watch straps in black flat calfskin at 22mm watch straps — the most formal Duro combination.
Leather watch straps in tan suede at 22mm watch straps — the most relaxed leather option. Warm tan on the black dial creates a casual dress-sport character.
Leather watch straps in navy calfskin at 22mm watch straps — for the blue bezel Duro variants. Navy leather on blue bezel creates a composed maritime formal combination.
The Duro Mod Culture
The Duro has one of the most active mod communities of any budget watch. WristyBizzle described it as "a potential strap monster" — the high-contrast black case accepts every material and every colour without contradiction. The watch is also widely modded with aftermarket crystals and bezel inserts — blue AR crystals and sapphire upgrades are common. A strap change is the first and lowest-cost mod available.
The combination that most reveals the Duro's potential is brown leather — the same transformation that the SKX007 and Vostok Amphibia are famous for. A $50 Casio on quality full-grain calfskin reads as a considered, characterful watch rather than an entry-level purchase.
The Casio Budget Dive Cluster
Casio W800H — 18mm watch straps. 100m budget diver. Tight lug clearance.
Casio MRW200H — 18mm watch straps. The NASA pilot diver. Tight lug clearance.
Casio Duro MDV106 — 22mm watch straps. The 200m dive watch. Standard lug clearance — any strap fits.
Recommended Combinations
Most celebrated — black tropical FKM at 22mm watch straps — vintage rubber on the budget diver.
Most warm vintage — brown tropical FKM at 22mm watch straps.
Most revealing transformation — leather watch straps in dark brown flat calfskin at 22mm watch straps.
Blue bezel most coherent — navy Marine Nationale elastic or navy FKM rubber at 22mm watch straps.
Most operational — black single-pass nylon at 22mm watch straps.
Most comfortable daily — Marine Nationale elastic at 22mm watch straps.
Most striking active — orange FKM rubber at 22mm watch straps.
Frequently Asked Questions
What size strap does the Casio Duro MDV106 take? 22mm watch straps — confirmed by multiple independent reviews and owner measurements. Some sources incorrectly list 20mm — this refers to the buckle end of the factory strap, not the lug width. The lug width is 22mm.
What is the best strap for the Casio Duro MDV106? Black tropical style FKM at 22mm watch straps for the most characterful active combination. Dark brown leather for the most celebrated dress-sport transformation. Marine Nationale elastic for the most comfortable daily option.
Is the Casio Duro MDV106 really 200m water resistant? Yes — the MDV106 is ISO 6425 certified to 200m. ISO 6425 certification is more rigorous than simple manufacturer water resistance claims — the watch is tested to 125% of its rated depth. The Duro is genuinely suitable for recreational scuba diving.
Why do some sources list the Casio Duro as 20mm? The factory strap on the Duro tapers from 22mm at the lug end to 20mm at the buckle. Some retailers measure the buckle end rather than the lug end and incorrectly list 20mm as the strap size. The correct lug width — confirmed by owner caliper measurement — is 22mm. A 20mm strap will fit loosely and is not recommended.
What does the Marlin logo on the Casio Duro mean? The Marlin is Casio's quality signal for dive watches. The diving marlin logo appears on the dial and is engraved on the caseback of all Casio watches rated at 200m water resistance or above. It indicates that the watch meets Casio's specification for serious water use rather than everyday splash resistance.
All CNS straps for the Casio Duro MDV106 are available at 22mm watch straps. Standard delivery worldwide. 30-day returns.