My Studio flip-flop blue.
01551388
YDDDYRRR
YY = 01 = 2001
DDD = 155 = June 4th
RRR = 388 = Nashville, TN, production number 88
I've only ever seen one other of this limited run colour scheme,(although it looks like there are at least another 87 :-)) and that was years ago on a trip to New York where some 10year old kid was on stage in the Red Lion pub in Greenwich Village where he was leading an otherwise mature-aged blues band.