Arnold & Son · Royal Collection

Strap for TEC1

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter44 mm
Reference1CTAG.S01A.C113G
FamilyRoyal Collection
MovementArnold & Son caliber A&S8305 Steel Hours, Minutes | Chronograph, Column wheel | Tourbillon Escapement
CasePalladium

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Royal Collection 1CTAG.S01A.C113G

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Royal Collection 1CTAG.S01A.C113G, seen from the bench

The Arnold & Son Royal Collection features the A&S8305 caliber in steel with hour, minute, column-wheel chronograph and tourbillon escapement functions. The watch integrates the visible tourbillon complication with the chronograph mechanism operated by a column-wheel. The movement combines the traditional tourbillon regulation with the chronometric precision of the mechanical chronograph system.

Frequently asked questions

What is the exact lug width of the Arnold & Son Royal Collection 1CTAG.S01A.C113G?

The lug width of the 1CTAG.S01A.C113G is precisely 20mm. This measurement represents the internal distance between the two lugs of the palladium case. To verify, measure from the inner edge of the upper lug to the lower lug, parallel to the dial. This dimension is standardised across all 44mm Royal Collection examples and determines compatibility with any third-party strap.

What strap is recommended for the Arnold & Son Royal Collection 1CTAG.S01A.C113G?

For the 1CTAG.S01A.C113G, we recommend three primary solutions: alligator (for maximum refinement and aesthetic harmony with palladium), shell cordovan with vegetable tanning (for chromatic evolution over time and structural lightness), and NATO in polyamide (for sporting versatility and moisture resistance). Selection depends on primary use: formal occasions favour alligator, daily wear favours shell cordovan, adventurous use favours NATO.

How is a strap changed on a 44mm Arnold & Son?

Strap replacement on a 44mm watch with 20mm lugs requires a spring bar tool. Insert the tool's tip into the under-lug hole, apply gentle pressure towards the case centre to compress the spring bar, then withdraw the strap. Repeat for the lower lug. For installation, insert the spring bar into the new strap's passant, compress with the tool and seat into the lug slots, releasing pressure gradually. Never force: a timepiece of this calibre deserves delicate handling.

Which third-party straps are compatible with the 1CTAG.S01A.C113G model?

All straps with 20mm lug width are compatible. Milano Straps curates a collection of third-party straps in alligator, calf, shell cordovan with vegetable tanning, NATO in polyamide and natural vulcanised rubber, all available in 20mm width and ready for dispatch. Each strap is tested to ensure millimetric fitment with the palladium lugs of the Arnold & Son.

What is the lifespan of a leather strap on a daily-wear watch?

Leather strap lifespan depends on usage intensity and material quality. An alligator or vegetable-tanned shell cordovan strap, worn daily and subjected to maintenance (light cleaning and annual conditioning), typically lasts 4–6 years before replacement. With occasional wear, longevity extends to 7–8 years. Frequent exposure to moisture and perspiration shortens this timeline; NATO or rubber options offer superior longevity in such scenarios, exceeding 10 years.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only