Rare Zenith Square Automatic in 18 kt yellow gold (16.50 g) and powered by the excellent Zenith-made calibre. The production of of round cases has always prevailed for wristwatches, especially as a technical choice. Even today, watches made with shaped cases are rare. Vintage models in yellow gold have been nicknamed 'cioccolatini' (chocolates) by collectors, especially when the case is made of solid gold, as is the case with this Zenith: one of the rare examples, made towards the end of the 1960s, in good overall condition and in very good working order. Not water resistant. Size: 30 x 30 mm. Thickness: 12 mm. Plexiglas crystal. Calibre: Zenith 2552PC. Frequency: 21,600 A/h. Jewels: 23.