Voicing of Gb Major 6

Drop 2 IV

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Left hand
Gb2
Right hand
Bb3Eb4Gb4Db5
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Drop 2

The Drop 2 IV voicing of Gb6 stacks Bb, Eb, Gb and Db from the bottom up: the major 3rd, 6th, root and 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 Gb6 are Drop 2 I, Drop 2 II and Drop 2 III.