Achmed Sukarno, volcano

6 digit serial # with 2 Block letters
(1st Block letter is always a capital, the 2nd is either a capital (e.g. 335583 SM) or in lower case (e.g. 566674 Ac)

6 digit serial # with 3 Block letters
(1st and 2nd Block letter are always capitals, the 3rd is always in lower case and the same as the 2nd Block letter (e.g. 112931 EGg)

For this note (both varieties) the following "Huisman Table" for fixed relation between serial # and Block letters is applicable:

P-19(1)
The first number of the serial # of this note is "3". So the possible first Block letters are R, S or T.
This note has the number 335583 SM

P-19(2)
The first number of the serial # of this note is "1". So the possible first Block letters are D, E or F.
This note has the number 112931 EGg

Conclusion: Both above notes could be genuine.