Strap for Sixties Chronograph Stainless Steel / Green / Annual Edition

The lug width (or lug size) of the Glashütte Original Sixties 1-39-34-05-22-04 is 20mm, a specification unique to this model. Precision measurement using a digital calliper between the two attachment holes on the case is essential, as even ±0.5mm tolerances can compromise strap fitment.

The optimal choice depends on intended use and aesthetic preference. An alligator leather with vegetable tanning in dark brown emphasises the watch's constructivist heritage and develops natural patina. For versatility, vegetable-tanned calf in cognac offers balance between elegance and durability (5–8 years). For tactical contexts, a black or anthracite-grey NATO transforms the Sixties into a tool watch whilst maintaining design coherence.

Strap replacement requires a dedicated spring-bar removal tool. Position the watch on a soft pad, locate the lateral holes where the pins emerge, use the removal tool to gently push the pin inward, then extract the old strap. Install the new strap by aligning the holes and reinserting the pins with uniform pressure. Avoid hammering, which damages case lugs.

Any strap with a 20mm lug width and maximum thickness of 4.5mm is compatible. Prioritise: alligator, quality calf leather (vegetable-tanned), shell cordovan, NATO in heavy-weight canvas (minimum 1.2mm), structured FKM rubber. Avoid generic e-commerce straps with uncontrolled tolerances, which cause chronic rubbing against the lugs.

Lifespan varies by material and wear pattern: alligator and shell cordovan exceed 10 years; vegetable-tanned calf lasts 5–8 years with quarterly maintenance; chrome-tanned calf 3–5 years. Daily wear reduces lifespan by 40% compared to weekly use. Periodic cleaning and annual conditioning extend life by 3–4 years.