The blues are pretty uncommon, relatively. Only thing less common in the 70s are red/maroon, silver or gold. I think I've only seen gold in the PY bikes.
Yours looks to be around 62cm based on the head tube size. There are at least two of us on BF right now with blue ones (
pics in this thread), but the vast majority you'll see on here and elsewhere are white.
The paint and decals are so nice on yours, you'd hafta be crazy to paint it.. Compare to the one in the 4th reply of that thread I just linked, also a '71, which is the more-typical well-ridden condition to find things.
Nice bike, and has the more popular lugset.