Junghans · Form

Strap for Form A Stainless Steel / White Arabic / Black Calf

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width18 mm
Case diameter39 mm
Reference027/4731.00
FamilyForm
MovementJunghans caliber J800.2 hours, minutes, seconds | date
Year2017
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the Form 027/4731.00

Selected for the 18 mm lug width · workshop selection

All 18 mm straps →

The Form 027/4731.00, seen from the bench

The Junghans Form features the automatic caliber J800.2 with hour, minute, second and date indications. The model has the reference 027/4731.00 and is distinguished by the essential design characteristic of the German manufacturer. The watch belongs to the Form collection, known for its minimalist approach to case and dial construction.

Frequently asked questions

What is the lug width of the Junghans Form 027/4731.00?

The Junghans Form 027/4731.00 features an 18 mm lug width. This measurement is crucial for aftermarket strap compatibility: any chosen strap must have an 18 mm width at its extremities to ensure perfect fitting without forcing or damage.

Which strap would you recommend for the Form 027/4731.00?

For the Form 027/4731.00, we recommend straps in noble materials that respect the minimalist Bauhaus design language. A black alligator strap with hand-stitched saddle seams is the most formal choice; a vegetable-tanned calf leather in brown or cognac tones introduces natural warmth; a grey NATO strap offers daily versatility. The choice depends on context and personal aesthetic preference.

How do I change the strap on the Junghans Form 027/4731.00?

The strap is replaced via the spring bar attachments located at the lug extremities. Using a dedicated spring bar tool or small flathead screwdriver, remove the elastic pin from the attachment, extract the original strap, and insert the new one, securing the pin again. The operation requires care to avoid damaging the case or lugs.

Can I fit an aftermarket 18mm strap on the Form 027/4731.00?

Absolutely. Any strap manufactured with an 18 mm width at its extremities is compatible with the Form 027/4731.00. We recommend selecting watch-quality straps from specialized craftsmen to ensure durability and wearing comfort equivalent to the original strap.

How long does a natural leather strap last on a Junghans Form 027/4731.00?

A quality leather strap, especially one crafted with vegetable tanning techniques, typically lasts 3-5 years with proper daily use. Lifespan depends on factors such as sun exposure, humidity, cleaning frequency, and tanning method. Leather straps naturally develop a patina that enhances their aesthetic appeal over time.

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