Frederique Constant · Index
Strap for Clear Vision Automatic Rose Gold / White
Takes 23 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
The Index FC-303V6B4, seen from the bench
Frequently asked questions
What is the lug width of the Frederique Constant Index FC-303V6B4?
The lug width of the Frederique Constant Index FC-303V6B4 is 23mm. This measurement refers to the distance between the two metal attachment points on the case where the strap inserts. To verify it, position a ruler between the inner edges of the lugs horizontally: the result will be exactly 23mm.
Which strap material is best suited for the Frederique Constant Index FC-303V6B4?
The optimal strap material for the FC-303V6B4 depends on intended use. For formal elegance, vegetable-tanned alligator in cognac or dark brown is highly recommended, as it develops a compelling patina over time. For versatile daily wear, English calf leather in black with steel deployante balances comfort and understatement. For conscientious sports contexts, a NATO fabric strap with tight weave or Burgundy shell cordovan offer character without compromising readability.
How do you properly change the strap on a Frederique Constant Index FC-303V6B4?
To change the strap, place the watch on a soft surface (microfibre cloth). Use a spring bar tool (fork-shaped device) to gently compress the internal spring of the pin connecting the strap to the lug. Once one side is freed, remove the old strap and insert the new one, ensuring the passants are correctly oriented and the new strap width is precisely 23mm.
Which aftermarket straps are compatible with the Frederique Constant Index FC-303V6B4?
Any strap with a 23mm lug width is compatible with the FC-303V6B4, regardless of material. It is essential to verify that the ansa width is precisely 23mm, not approximately. Milano Straps offers an extensive selection of models in alligator, calf, shell cordovan, rubber and fabric, all customisable in size and finishing and certified for artisanal quality.
How long does a natural leather strap last on a Frederique Constant Index FC-303V6B4?
The lifespan of a natural leather strap varies according to frequency of use, climatic conditions and type of tanning. A calf strap with vegetable tanning or an alligator strap can last 3-5 years with moderate daily use, developing a desirable patina over time. Leather at the case attachment points (stress points) shows the first signs of wear after 2-3 years. Proper maintenance—avoiding prolonged moisture and occasionally applying specific conditioners—significantly extends the useful life of the strap.
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