Serial no: 1 393 716 (1955).
Technical data: IWC cal: 88
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16/18 jewels, manual wind, sub second.
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Size: 12''' 26.5 mm.
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H: = 3.85 mm.
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N: = 18.000 A/h.
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Mainspring: 1.50 x 10.5 - 0.105 - 400
Versions:
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88: sub second, 1946-1964, 37.200 pcs.
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89: sweep second, 1946-1976, 220.200 pcs.