question about proximity of hp41c/cv serial numbers

[Martin Hepperle]

Are there some published production numbers of the HP 41 and maybe its variants?
Similarly for the 71 and other calculators?

Assuming 1 Million (is this correct?) produced at a rate of 45000 per week = 22 weeks.
At that rate, the whole HP 41 production would have taken less than one year.

The assumed numbers peer week seems to be a bit on the high side.