Please tell me more about CAL 70

Hello,

I'm Peter from Germany.

I just purchased this beautiful IWC with a Cal. 70 movement.
Regarding it's case number it seems to have been produced in 1946.
The Arabic indexes on the black dial are gold coloured and raised.

I looked for more informations about this Cal. 70... it is always referred to
as very rare movement.
Only 4800 seemed to be produced. Why? What was the reason?
As far as I understand most of similar looking watches of that time had the
Cal. 83 inside.

Best Regards
Peter

Hi Peter,

there has been a tread about Cal. 70 which is now in the Archives.

forum.iwc.com/t/is-there-some-information-about-
cal-70/13411/#post-7124

(copy the whole link into your browser)

if you cannot access it please let me know.

Here is a Picure of mine.

br

Cromagnonman

Hi, sorry- but the link does not work ...

Best Peter

if you copy the whole string into the URL address Filed of you browser it
should work

CAL 70

the link to the Archive is under the link above, thats the only way it works

br

Cromagnonman

Hi Peter,

did the second Link i sent work for you?

If not then send me a mail an i will send you a pdf of the thread about Cal.
70

c r o m a g n o n m a n AT o u t l o o k D OT c o m

br

Cromagnonman

Hello, the last link worked! Thank you!

I think the c.70 and the c.89 c.88 where developped together.

The have very similar serial numbers c.70 (only 4 series of 1200 Pieces)

1'096'001 - 1'097'200

1'100'201 - 1'101'400

1'104'401 - 1'104'600

1'111'601 - 1'112'800

The c.89 with the same winding and and barrel arrangement started with

1'109'201 -1'110'400

..... and many others, totally 220'200 pieces produced

the small second version c.88 starts

1'110'401 - 1'111'600 ("only" 37'200 produced)

So we have tree consecutive series:

within 1'109'201 - 1'112'800

c.89 ; c88; c.70

I think the c.70 (why this odd number?) was produced as tial to build a
cheaper movement, when the c.88/c.89 was developped. So a free movment number
was
used (inserted) for it. (The c.69 had not hunter pendant, so c.70 was free).

Probably the c.70, which had compared to the c.88/89 a flat balance spring and
only 3 bridges. The c.88/90 has a brequet balance spring and 5 bridges.

Left c.70 right c 88;

Quites imilar

regards Ralph