When is a 200mm lens an 87mm lens?

As the following posts on Nikonians explain, internally focused lenses usually have shorter focal lengths when focused at distances closer than infinity.

Interesting reading at Nikonians.com:

The Nikkor 18-200 VR is a good example
And the discussion of the Nikkor 18-200 VR goes on here
The Nikkor 70-200 VR doesn't seem to have this issue