Strap for Planetarium

The lug width of the Christiaan van der Klaauw Astronomical Masterpieces CKPT7705 is 20 millimetres. This measurement represents the distance between the mounting lugs on the case. It is essential to verify this dimension before purchasing an aftermarket strap to ensure perfect compatibility and a gap-free fit.

For the Christiaan van der Klaauw Astronomical Masterpieces CKPT7705 in white gold, we recommend a superior-quality alligator with fine grain (chocolate brown or black) or vegetable-tanned calf leather. These materials reflect the elegance of the case and age beautifully. For casual wear, a NATO strap or quality elastomer provides versatility whilst maintaining the formal dignity of the timepiece.

To change the strap: (1) use a delicate spring bar tool positioned under the lug pin; (2) lift slightly to release the internal spring; (3) extract the pin completely; (4) remove the old strap; (5) insert the new strap (ensuring it is exactly 20mm wide); (6) reinsert the pin, aligning it perfectly with the case lugs. If unfamiliar with the procedure, Casati Milano offers bespoke assistance by appointment.

Yes, any strap with a 20-millimetre lug width is compatible with the CKPT7705. However, we recommend selecting materials and finishes that respect the elevated quality standard of the white gold case and internal complication. Avoid poor-quality synthetic straps or untreated hides, which would contrast with the craftsmanship of this astronomical timepiece.

Strap longevity depends on usage intensity, climatic conditions, and leather quality. A superior alligator or vegetable-tanned calf strap typically lasts 3–5 years under daily wear, developing an increasingly noble patina over time. NATO or elastomer straps may last 5–7 years. Regular maintenance (gentle cleaning and rapid drying after moisture exposure) significantly extends longevity.