For this note the following findings of Rob Huisman for fixed relation between serial # and Block letters are applicable:

● 6 digits serial # beginning with 1, 2, 3 or 4
● 2 capital. Block letters of the same size (exeption: the “X” is often a little smaller than the usual character size)
● 1st Block letter: L, M, N, O, P, R, S, T
● 2nd Block letter: P, R, T, U, V, W, X
 
The 1st number of serial # of this note is "2".
The 1st Block letter is "T"
The 2nd Block letter is "T"

This note has the number 201106 TT

Conclusion: It could be genuine.