This is a description of a rare early model waterproof watch called "Spireno," which was produced by Universal in the early 1950s. It's a masterpiece of the Tricompax series, the flagship model of Universal, and the first to incorporate waterproof functionality. Featuring a small round pusher and a dust cover, its thick, round case shape adds a distinctive presence among the varied Tricompax models.
The silver dial, characteristic of the 1950s, combines wedge indexes with alpha hands, giving it a sporty impression. As Tricompax watches with waterproof features were later changed to twist lug cases in the late 1950s, the early Spireno cases are both scarce and valuable due to their limited production and distribution numbers.