Sinn
Instrument Watches 556.0101— lug 20mm
Sinn Instrument Watches 556.0101: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
Sinn 556.0101The essential strap measurement.
Browse 20mm straps →556.0101
ETA caliber 2824-2 Hours, Minutes, Seconds | Date
The Heritage
Compatible Straps
Selected for the 20mm lug width of the Instrument Watches
FAQ
What is the lug width of the Sinn Instrument Watches 556.0101?
The lug width of the Sinn 556.0101 is 20 millimetres. This measurement, also referred to as anse width, is determined by the proportions of the 38.50 mm case and represents the distance between the two vertical lugs where the strap anchors. Precise measurement with a digital calliper is essential before purchasing an aftermarket strap: tolerance must be tight to prevent lateral strap movement.
Which strap is most suitable for the Sinn Instrument Watches 556.0101?
For the 556.0101, the choice depends on your intended use. A calf leather strap with vegetable tanning (dark brown tones) offers instrumental elegance and develops authentic patina. If tactical or water-immersion use is prioritised, vulcanised rubber straps provide durability without maintenance. Ballistic nylon NATO straps represent a versatile compromise between refinement and practicality. Alligator straps represent the most sophisticated choice, though they require temperate climate and regular care.
How do you change the strap on the Sinn 556.0101?
Strap replacement requires a spring bar removal tool, a small lever that accesses the removable lugs. Position your watch on a soft surface and carefully insert the lever into the lateral gaps of the upper lug, then push gently to release the elastic rod. Repeat for both sides. Install the new strap by aligning the strap holes with the lugs and snapping the rod into position. Verify that the strap is stable and does not tilt laterally.
Are there aftermarket straps compatible with the Sinn 556.0101?
Yes, the Sinn 556.0101 is compatible with all standard 20 mm lug width straps. Milano Straps offers a dedicated range of leather straps (calf, alligator, shell cordovan), NATO, and rubber straps, all contoured to 20 mm specification. Always verify that the internal hole diameter conforms to specifications to avoid mechanical play.
How long does a leather strap last on the Sinn 556.0101?
The lifespan of a leather strap depends on the tanning method used and environmental conditions. A vegetable-tanned calf strap, on a watch worn daily, maintains structural integrity for 3-5 years. Alligator, being more resistant to torsion, may last 5-8 years. Humidity accelerates ageing, as does prolonged direct sun exposure. Regular application of leather balm preserves flexibility and extends the strap's working life.