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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

IWC 89 Zwyro

manual wind
sweep second

12''', Dm= 26.5mm
H= 4.25mm
17 jewels
f = 18000 A/h

Balance staff U1658

Stem W1268

Mainspring / battery
1.45 x 0.12mm

Comments about the data

1969, ca. 20 pieces
Breguet hairspring
adjustment screws on balance spokes
manually engraved, damaskeened, and gold plated by Zwyro
The watches were produced in 1969 with the Ref. 810, but sold in 1975. As the reference numbering system was meanwhile changed, they are recorded at IWC with the correct case- and movement numbers, but with the "wrong" Ref. 2600.
Zwyro was owned by Mr. Zwyssig, a former technical director from IWC. This is the reason for a double "Z" (back to back) hidden in the decoration.

Example, year: signature; shock device
1969: 1932747, International Watch Co Swiss, ZZ - IWC Probus Scafusia; Incabloc

Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.

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