Omega · Seamaster Planet Ocean
Strap for Seamaster Planet Ocean 600M Co-Axial 42 Stainless Steel / Diamond / Black / Alligator
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Straps for the Seamaster Planet Ocean 232.18.42.21.01.001 (aka: 23218422101001)
Selected for the 20 mm lug width · workshop selection
Black Alligator Strap with Light Blue Edges€149
Red Alligator Strap Water Resistant€195
Green Rubberized Alligator Strap with Ecru Tribal Stitching€149
Military Alligator Green Strap€138
Hammered Calfskin Strap Light Blue€98
The Seamaster Planet Ocean 232.18.42.21.01.001 (aka: 23218422101001), seen from the bench
Frequently asked questions
What lug width does the Omega Seamaster Planet Ocean 232.18.42.21.01.001 have?
The Omega Seamaster Planet Ocean reference 232.18.42.21.01.001 features a 20mm lug width, measured between the two case lugs. This measurement is standard for the 42mm model and fits perfectly with any 20mm strap available on the market.
Which strap is best suited for the Seamaster Planet Ocean 42mm?
For the Seamaster Planet Ocean 42mm we recommend a quality alligator strap with natural grain if you seek elegance, or vegetable-tanned calf leather for durability and patina development over time. For frequent water use, premium FKM rubber is the most practical technical choice. NATO remains true to the model's military heritage.
How do you change the strap on the Seamaster Planet Ocean 232.18.42.21.01.001?
The Seamaster Planet Ocean 232.18.42.21.01.001 features a screwed lug: insert a small screwdriver into the hole on the case lug and turn counterclockwise to loosen the pin. Once removed, the strap comes off easily. Slide on the new 20mm strap, align the holes, and secure the pin by turning clockwise until fully tightened.
Are there aftermarket straps compatible with the Seamaster Planet Ocean 20mm?
Yes, any strap with a 20mm lug width is compatible with the Seamaster Planet Ocean 232.18.42.21.01.001. Online you will find 20mm straps in alligator, calf leather, NATO, rubber, and other materials, all adaptable without case modifications. Choose according to your style and usage needs.
How long does a leather strap last on an Omega Seamaster Planet Ocean?
An authentic leather strap (alligator, calf, shell cordovan) on a Seamaster Planet Ocean typically lasts 4-7 years with regular use, provided you protect it from excessive perspiration and prolonged immersion. Vegetable tanning improves with use, developing patina and character. Rubber and NATO straps last longer, 7-10 years, thanks to their resistance to environmental factors.
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

