Strap for Speedmaster Professional Moonwatch Apollo XIII 25th

The lug width is 20 millimetres. This dimension is intrinsic to the case geometry and represents the historical standard of the Moonwatch. To measure correctly, position a calliper between the lug pins (not the external diameter of the pins): the internal distance must be precisely 20 mm.

For this model we recommend black or dark brown alligator (1.4–1.6 mm thickness), vegetable-tanned calf, shell cordovan, or grey or beige textile NATO. Alligator is the choice of discrete luxury that does not compete with the dial; calf develops a natural patina over the years; NATO restores the model's military heritage.

Remove the watch. Position the strap on a soft surface. Using a spring bar tool, gently press the spring pin towards the opposite side of the lug, creating sufficient space to extract the pin. Repeat for the other lug. To insert the new strap, align the holes with the pins, press the spring pin downward with the tool, then snap the strap into position.

Yes, any strap with 20 mm lug width is compatible. Artisanal aftermarket straps allow customization in leather, colour, thickness and buckle type. Ensure that the strap thickness is 1.4–1.8 mm to avoid mechanical play at the lug attachment.

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3–7 years with daily use, provided regular maintenance: dry after exposure to humidity, avoid prolonged contact with salt water, apply leather conditioner every 6–12 months. Vegetable tanning develops a protective patina over time, extending useful life.