Strap for Senator Perpetual Calendar Stainless Steel / Blue / Bracelet

The Glashütte Original Senator 100-02-07-12-70 features a lug width of 20mm precisely. This dimension is crucial to the aesthetic balance of the 42mm case. To measure correctly, position a ruler at the lug seat on the case: the distance between the two attachment points must be exactly 20mm. Do not measure the spring bar or other sections—only the point where the strap attaches to the case.

For the Senator 100-02-07-12-70, alligator leather represents the ideal formal choice: its geometric grain dialogues perfectly with the case's rational lines. Dark brown or black tones ensure maximum formality. For those desiring patina evolution, vegetable-tanned calf leather is excellent. Alternatively, a quality NATO strap offers daily versatility, whilst FKM rubber provides practical durability.

The Senator 100-02-07-12-70 uses a spring bar lug system. Position the watch on a soft surface, then use a dedicated spring bar tool to gently compress the internal spring of the lug. Move the old strap outward to release it. Insert the new strap into the seat, returning the lug to position. Verify that it is securely fastened on both sides. If you lack the proper tools, consult a professional watchmaker.

Yes, any strap with a 20mm lug width is compatible with the Senator 100-02-07-12-70. High-quality artisanal leather, NATO, or rubber straps fit perfectly into the spring bar lugs. We recommend straps from specialized manufacturers that respect the build quality and aesthetic of your watch. Avoid generic straps: the Senator deserves materials and finishes consistent with its positioning.

Leather strap durability depends on frequency of use and material quality. An alligator or vegetable-tanned calf strap, worn daily under normal conditions, typically lasts 3–5 years. Constant exposure to moisture, direct sunlight, and perspiration reduces longevity. Vegetable tanning develops natural patina but requires occasional maintenance. With appropriate care and rotation with other straps, useful life extends considerably. Periodic replacement is part of fine watchkeeping culture.