Vixen LV - color-code-ring mixup. Blue ring - 6 mm ??

I do have an older - 10 years ? - Vixen LV 6 mm
with a light blue color ring (code equivalent to focal length)
and an adhesive label with eyepiece data, 6 mm that is.
The data is not painted directly on the rubber, as on todays LV´s.

I suspect it for not being a 6 mm, but a 5 mm, as the color code
would show it to be on todays LV´s.
The difference in magnification is plus 20 percent, and thereby
extending beyond the scope´s teoretical limit and "capacity".
The view has always been a little too dull and blurry.
Having no possibilty to measure field of view:
- anyone has the same blue color ring on the 6 mm (older) LV?

If it is surely a 5 mm, I will go for a new 6 mm instead.

Pete