Junghans
Max Bill 027/3501.00— lug 20mm

The Junghans Max Bill 027/3501.00 features a lug width of 20 millimetres. This measurement is critical for selecting a compatible strap: a 20mm strap seats perfectly between the lugs, with the outer edges of the strap aligning precisely with the inner edges of the case lugs. An incorrect measurement results in visible gaps or, worse, case instability on the wrist. When purchasing an aftermarket strap, always verify that the lug width is specified as 20mm.

The choice depends on intended use and aesthetic preference. For formal wear, we recommend a vegetable-tanned leather strap in cognac or mid-brown—materials that age naturally and develop complex patina over time. If versatility is your priority, a grey stone NATO strap maintains the rigorous geometry of the original design whilst introducing sporty character. Shell cordovan represents the most sophisticated option for those intending to keep the watch as a multi-year companion. For intensive use, vulcanised natural rubber provides assured grip and industrial aesthetics faithful to the Max Bill's functionalist DNA.

The Max Bill 027/3501.00 uses standard fixed-lug attachments. To remove the original strap, locate the pins that traverse the lugs and strap: using a spring bar tool (a two-pronged instrument), push the pin downward to release the internal spring, then extract the pin. Repeat on the opposite lug. To install the new strap, align the holes of your 20mm strap between the lugs, insert the pins with the spring bar tool's assistance, and verify that the strap sits firmly and centred. If uncertain, consult a professional watchmaker.

Any strap with a certified 20mm lug width is compatible with the 027/3501.00. Milanostraps offers a dedicated collection of 20mm straps, crafted in quality leather (calf, alligator, shell cordovan), canvas (NATO), and natural vulcanised rubber. Every product is tested to ensure correct adhesion between the lugs and comfortable wearability. Avoid straps of approximate measure (19.5mm or 20.5mm): even small discrepancies cause instability or unwanted gaps.

Leather strap longevity depends on material quality, usage frequency, and care. A high-quality vegetable-tanned strap, worn regularly on a single lug, typically lasts 3–5 years before leather begins to yield near the pins. Shell cordovan, given its superior fibre density, may last 7–10 years. Vulcanised rubber exhibits similar longevity but degrades more gradually under UV exposure. To extend lifespan, rotate the strap amongst multiple lugs (if you own multiple straps), protect it from prolonged moisture, and occasionally apply a protective balm. A well-maintained strap not only lasts longer but develops patina that narrates the story of its wearer.