Voicing of Dominant b5

Drop 2 IV

Back to C7b5

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Left hand
C3
Right hand
E4Bb4C5Gb5
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Drop 2

The Drop 2 IV voicing of C7b5 stacks E, Bb, C and Gb from the bottom up: the major 3rd, minor 7th, root and flat 5th of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for C7b5 are Drop 2 I, Drop 2 II and Drop 2 III.