FAA patch

[Leonard D]

Hi All, I wonder if I might enlist some help in an attempt to establish the vintage of the pictured bullion Air Gunner/Telegraphist patch.
I understand the patch was worn from the 30's into the 50's. There is partial makers label to the rear which I believe is Griscti Embroidery Malta. Would that perhaps be an indicator of a time frame. Internet search was not helpful.
Cheers.
Len