How to play a C#7b5 chord on Accordion

AKA: C#7(b5), C#7/b5, C#7(-5), C#7 Flat 5, C# Dominant 7th b5, C# Dominant Seventh Flat Fifth

 

Notes:

C#, E#, G, B

Intervals:

R, 3°, dim5°, m7°

Left hand:

C# + G7

Fingering:

2 + 5 (bass pattern)

or

3 or 4 + 2 (counter bass pattern)