Archimede
Klassik UA4929-A3.11— lug 18mm

The lug width of the Klassik UA4929-A3.11 is 18mm. This value represents the distance between the two attachment points of the lugs on the case. It is a precise measurement that does not allow approximations: a strap must be crafted specifically for this width to ensure a secure fit without play.

We recommend three artisanal options: (1) alligator with vegetable tanning, for the visual dialogue with the case's satin texture; (2) calf leather with vegetable tanning, more understated and versatile; (3) NATO in silk or heavy cotton, for a less formal appearance and the practicality of quick replacement. The choice depends on frequency of wear and context—leather for formal occasions, NATO for dynamic daily use.

The strap is removed via the spring bars. Position the removal tool (sprung bar tool) under the bar, compressing the internal spring: the bar disengages from one side of the case. Repeat on the other side. To install the new strap, insert the bars into the lug holes and verify that both bars snap correctly into position. If the strap is artisanal, ensure that the slots have been machined to the exact width of 18mm.

Yes, provided the aftermarket strap has been crafted specifically for the 18mm lug width. Generic straps labelled 'universal' risk not fitting correctly. We recommend always checking the technical specifications of the strap and, in case of doubt, contacting the maker to confirm compatibility with the 18mm measurement.

Durability depends on frequency of wear, tanning method, and leather quality. A vegetable-tanned leather strap on a 36mm model like the UA4929-A3.11, worn daily, has a useful life of between 2 and 4 years before requiring replacement for aesthetic wear. With occasional wear (2–3 times per week), it can last 5–7 years. The leather will mould to your wrist and develop characteristic patina, but the slots may wear or the buckle may deteriorate—these are normal signs of ageing, not defect.