Strap for Real Moon Joure

The lug width of the CKRJ7705 is 20 millimetres. This measurement represents the internal distance between the two lugs on the case and must be measured precisely before ordering an aftermarket strap. Compatible straps must have an internal width of 20mm to ensure secure and proportionate fitting.

Given the astronomical identity and white gold case of the CKRJ7705, the optimal choice is a black alligator strap with vegetable tanning. This material imparts formal elegance, develops a natural patina over time, and the grain of the leather creates a visual texture that amplifies the celestial theme of the dial. Alternative finishes include French calf, shell cordovan in brown, or cotton NATO for enhanced versatility.

Strap replacement involves extracting the spring bars that connect the strap to the case lugs. Use a dedicated spring bar tool or a blunt instrument (never sharp) to avoid scratching the white gold. Position the tool in one of the lateral holes near the lug, apply gentle inward pressure toward the case centre, and the strap will detach. Repeat with the other spring bar. To remount: insert one end of the spring into the hole, slide the strap through, and press until the spring clicks into position in the second hole. This operation is fully reversible and requires no watchmaking expertise.

Yes, high-quality aftermarket straps are entirely compatible with the CKRJ7705, provided the internal width is precisely 20 millimetres and thickness does not exceed 4.5 millimetres. Artisanal straps in alligator, calf, shell cordovan or NATO are valid and recommended options. Avoid straps with excessive thickness or imprecise manufacturing tolerances, as these may create stress on the spring bars and attachment points of the case.

The lifespan of a leather strap depends on usage patterns and tanning method applied. A strap in vegetable tanning, such as alligator or shell cordovan, may last 5–10 years with routine maintenance (periodic cleaning and conditioning with vegetable oils). A French calf strap with contemporary tanning typically lasts 3–5 years before replacement becomes necessary. The white gold case does not chemically attack leather, but constant contact with perspiration and wrist moisture accelerates natural ageing. Rotating secondary straps (NATO, rubber) significantly extends the longevity of each individual leather strap.