A Collected Man - Zenith meant business with the S.58. Introduced in 1958 (subtle clue in the name) as a tool watch expressly designed for military use. According to Manfred Rössler, in
ZENITH, S 58. - Bukowskis
Coin des Affaires - Zenith s58 diver
ZENITH, S 58. - Bukowskis
Zenith S.58: For Your Reference - by Tony Traina
Montre vintage Zenith S58 automatique année 1958
Zenith - S.58 Original Vintage Automatic Steel Watch - Cal. 133.8 - Lorologiese Fine Watches