How to play an Ab7b5 chord on Accordion

AKA: Ab7(b5), Ab7/b5, Ab7(-5), Ab7 Flat 5, Ab Dominant 7th b5, Ab Dominant Seventh Flat Fifth

Notes:

A♭, C, E♭♭, G♭

Intervals:

R, 3°, dim5°, m7°

Left hand:

Enharmonic G# + D7

Fingering:

2 + 5 (bass pattern)

or

3 or 4 + 2 (counter bass pattern)