1960s Zenith "Port Royal" Cal.135 Steel

Only about 11,000 of Zenith's famous caliber 135 were made in the 1960s, and it left its mark as a genuine chronometer that was not only rare but also highly accurate. The "Port Royal" is considered to be one of the finest models, and even the dial and hands are made of gold. Only a few steel models were produced along with the YG and WG models, and their scarcity is undoubtedly a rare gem.