A - B - C - C - D connection (QUINTUPLICATE)

Displayed here is the closest I have come to completing a QUINTUPLICATE run. Since 1981 (when I started my blue Chase run),
I have never seen this Chase with a
DRUM back.
What is the probability that at least one blue Chase DRUM exists ?
Note....the
A - B - C - D connection of the 350-only Series was printed on
190 subjects.
TED Z
T206 Reference
.