Silicone Rubber Strap for Omega Seamaster 300 – 20mm

Description

The Seamaster 300 has a direct lineage to the professional dive watches of 1957 — the original Seamaster 300, worn by military divers and test pilots when dive watches were tools rather than collector items. That heritage doesn’t demand rubber. But it earns it. The Omega Seamaster 300 Silicone Rubber Strap is built for one reference, at one width, at the dimensions that suit it: 20mm, 120mm + 85mm, high-quality silicone for flexibility and water resistance, an 18mm buckle closure. Everything the Seamaster 300 needs in a daily-wear rubber strap, and nothing it doesn’t.

One Reference. Silicone Built for It. Standard Proportions That Fit.

• High-quality silicone rubber — flexibility and water resistance by construction — the Seamaster 300’s 300m rating implies a strap that can match it without conditions. Silicone provides genuine water resistance rather than splash tolerance, flexibility that follows the wrist through the full range of activity the Seamaster 300 was designed to support, and the maintenance-free performance that makes it the practical daily choice across varied environments. It handles the pool, the sea, and the shower equally, and looks the same coming out as going in.
• Specific to the Seamaster 300 at 20mm — this strap is built for one reference rather than shared across a combined compatibility listing. The 20mm dimension is correct to the Seamaster 300’s lug specification, and the strap is sized and shaped for this case rather than approximated across a broader model group.
• 120mm + 85mm — standard proportions for standard daily wear — where near-symmetrical strap splits suit active dive use, the 120mm + 85mm proportions are the conventional configuration for a strap worn through the full range of daily contexts a Seamaster 300 inhabits: morning gym, commute, office, evening. The 120mm long side covers the wrist range correctly, the 85mm short side provides the adjustability to close comfortably at the mid-buckle position where a strap wears best.
• 18mm buckle — correctly proportioned to the 20mm strap — the 18mm buckle size sits in correct visual scale to the strap’s 20mm width at the buckle end, keeping the hardware proportional to the band it closes.
• Comfortable fit for everyday wear and aquatic activities — silicone’s immediate comfort, combined with the 120+85mm proportions that suit daily rotation, makes this the strap for the Seamaster 300 that goes everywhere every day — without the care requirements of leather or the weight of the original bracelet.

For the Seamaster 300 That Goes on Every Day.

The Seamaster 300 was designed for sustained, active use by professionals who had no patience for equipment that required babysitting. A silicone strap in standard proportions for a watch that fits this brief is not a compromise configuration — it is the straightforward, correct choice for the owner who wears the watch into every context their day creates, without thinking about what the strap can and can’t handle.

This strap is the right choice for:

• Seamaster 300 daily wearers who want a single rubber strap in standard proportions that works correctly through everyday wear including aquatic activities, without the complexity of near-symmetrical sizing or multiple buckle finish options.
• Owners rotating between bracelet and rubber who want a straightforward 20mm silicone option for the Seamaster 300 specifically — not a combined listing shared with the Planet Ocean.
• Active lifestyle wearers who take the Seamaster 300 through gym sessions, swimming, travel, and varied outdoor activities and want a strap that handles all of it without asking anything in return.
• First-time silicone strap buyers for the Seamaster 300 who want the correct standard-proportion option for this reference before considering the specialised dimensions or finish-matched variants.

Specifications

Silicone, standard proportions, the Seamaster 300 exactly. Add to cart and wear it everywhere.