I just checked my MN10 and MN11. They both have a brown(?) base, but they are marked MN10 & MN11 on the lamp side of the base. Sorry no pink here.
The reason I put a question mark behind the brown is because it looks like a aged and discolored clear, the color kind of reminds me of a plastic shirt button made to look like imitation bone color.
Just to be clear both my MN10 and MN11 have the same color base. /ubbthreads/images/graemlins/icon3.gif