Strap for Senator Perpetual Calendar Red Gold / Black / Alligator / Folding

The lug width (ansa) of the Glashütte Original Senator 100-02-25-05-05 is 20mm. This measurement refers to the distance between the spring bars attached to the case. It is essential to measure this precisely using a digital calliper, inserting it perpendicularly between the two contact points, to ensure compatibility with any aftermarket strap.

For the Glashütte Original Senator 100-02-25-05-05 in rose gold, the ideal strap is in alligator leather with a fine grain texture in dark brown or black. Alligator respects the geometric elegance of the dial and the luminosity of rose gold without competing visually. Alternatively, calf leather with vegetable tanning offers a more artisanal approach, philosophically aligned with Saxon watchmaking tradition.

Changing the strap on the Glashütte Original Senator 100-02-25-05-05 requires a specialised tool: a spring bar remover. Position the tool beneath the lug attachment from the underside, lift gently to release the internal spring, then extract the bar. Repeat on the other side. Insert the new strap by aligning the holes with the bars, then reinsert the bars until you hear a click. It is advisable to consult a qualified watchmaker to avoid case damage.

All straps designed for 20mm lug width are compatible with the Glashütte Original Senator 100-02-25-05-05. Optimal choices include bespoke straps in alligator, shell cordovan, calf leather with vegetable tanning, or NATO and FKM rubber straps. Milano Straps offers a comprehensive selection of artisanal 20mm straps, customisable in colour, thickness and texture.

A quality leather strap (alligator, shell cordovan, artisanal calf) has an average lifespan of 5–7 years with daily use, assuming proper maintenance. Longevity depends on moisture exposure, frequency of use and tanning method. Vegetable-tanned leather tends to age more visibly but retains structural integrity longer. We recommend rotating the strap periodically and applying a natural protectant (beeswax, mink oil) every six months.