How to play a B7b5 chord on Accordion

AKA: B7(b5), B7/b5, B7(-5), B7 Flat 5, B Dominant 7th b5, B Dominant Seventh Flat Fifth

Notes:

B, D#, F, A

Intervals:

R, 3°, dim5°, m7°

Left hand:

B + F7

Fingering:

2 + 5 (bass pattern)

or

3 or 4 + 2 (counter bass pattern)