IWC cal 89

This is a manual wind IWC steel watch, which is powered by their famous calibre 89. What is unusual about this example is that the movement is marked as being adjusted to three positions. IWC were one of the few Swiss manufacturers in the 1950s who didn't submit their watches for chronometer certification at one of the Swiss observatories. I understand that IWC believed that their in-house testing was of a higher standard that the testing regime at the observatories.

So this watch movement was specially adjusted to a higher standard than the already elevated standards of IWC. For reasons known only to IWC, they didn't feel this warranted any additional printing on the dial. The watch was retailed in the USA - we can tell this because the foot of the balance cock is marked with a three letter code import code denoting IWC (confusingly this is the letters "CYN") 


Specifications:
Case diameter (excluding winding crown): 35mm
Case material: stainless steel
strap width: 18mm
time keeping: grade A