Movement
Calibre 23ZSD
← Back to all Calibres1954 – 1958
Lignes
10.5
Mounting Diameter
23.3
Thickness
5.55
Frequency (vph)
18,000
Jewels
17
Power Reserve
44
Complication
Center Seconds, Date
Power
Manual
Shape
Round
Size
Medium
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Technical Diagram
Notes
Developed 7 years after the 23ZS and around the same time as Longines other calendar calibre, the 19ASD, the 23ZSD applied similar strategies to achieve a date complication. and this calibre would be the primary manual winding date calibre until the late 1950s.
23Z: sub second
23ZD: sub second, date
23ZS, 23ZN: sweep second
23ZSD: sweep second, date