Missioncoonery: Here is what I could find out. First, Dynaudio NA was less than helpful. I asked whether they could give me a manufacture date for the C1's if I had the serial numbers? Their answer - no, call Denmark. Then I asked for a phone number directly to a person in customer service there and was told to look at the Danish website. Really disapointing.
But independantly, I know the following:
C1 - serial numbers 519,841 and 519,842 are from the Stereophile review in November of 2007.
C1 - serial numbers 509,125 and 509,126 were purchased 4-months ago in India, and
C1 - serial numbers 514,327 and 514,328 were purchased sometime late in 2007 in Arizona.
I am not sure you can conclude anything from the above comments other than the NA customer service from Dynaudio isn't particulary good. I hope customers with service requests are having a different experience.