Achmed Sukarno

with underprint

without underprint

● 6 digit serial # with 2 Block letters
● the first digit of the serial # is always "0"
● the 1st Block letter is always a capital, the 2nd is either a capital or in lower case (e.g. 064562 IK or 084397 Ur)

For this note the following "Huisman Table" for fixed relation between serial # and Block letters is applicable:
(Attention: as "First number" the 2nd digit of the serial # is applicable - not the "0"!)

The first (in fact 2nd and thus relevant) number of the serial # of this note is "8". So the only possible first Block letter is U, W or V.
This note has the number 084397 Ur

Conclusion: It could be genuine.