A vintage and recently serviced Juvenia Arithmo Slide Rule tool watch from the 1950s, featuring a stainless steel case in well-preserved condition. Marketed at the time as the "first calculating watch," it was designed for mathematical and engineering applications. The outer bezel, referred to as the slide index, is made of durable glass and rotates in both directions, while the inner bezel remains stationary. The watch has a distinctive domed, donut shaped crystal, with the bezel and face also subtly curved.

The case is in excellent condition, with the still prominent Juvenia signature on the caseback. The slightly patinaed dial features gold-colored Arabic and baton hour markers, gold hour and seconds hands, and a black dotted minute track. The circular slide rule adds a functional and unique element. The crystal is in excellent condition as well. Fitted with a new Saffiano strap.

Model: Arithmo

Size: 36mm

Material: SS

Bracelet/Strap: Leather

Dimensions: 36mm

---

---