On the left is my '04 660/12, on the right my '05 4004L.
The difference is pretty vast between the two - the guitar has stayed true blue, while the bass has become a "green boy". Interestingly, though, my 660/12 has been played a whole lot, and has never spent any time tucked away in a case, away from light.
It seems like the Blue Boy instruments that shipped in '05 were already green by the time they left the factory, while the '04 ones, in my experience, have been the beautiful shade of blue - and most seem to have stayed that way. Perhaps the formula changed?
Here's a pic of a February '04 370/12BB I had for two years - it's color NEVER swayed and was played a lot/left out as well. Pics were taken in late '05, right before I sold it:
I'd like to hear from other Blue Boy owners with the year of their guitar/bass and if it's stayed blue or not.

