How to play a C#m7b5 chord on Accordion

AKA: C#∅, C#1/2dim, C#1/2dim7, C#7°5, C#7b5, C# Half-diminished, C#m7(-5), C#m7°5, C#m7b5, C#min7dim5, C# minor seventh flat fifth, C# minor seventh flat five, C#ø, C#º7

You can choose to play the bass (circled in green) or the counter bass (circled in blue). I prefer playing the bass but both positions are quite comfortable.

Notes:

C#, E, G, B

Intervals:

R, m3°, m5°, m7°

Left hand:

C# + Em (D♭ + F♭m)

Fingering:

2 + 4 or 3 + 5

or 4 + 2 on counter-bass