I've added a link to the Hey Hey under "Variation" above, but I don't see it in the 1930 edition of The Savoy. Do you know when/where the Hey Hey first appears? Have I missed the obvious?
I guess I misremembered, but it's the same recipe as the other three. The earliest I can find it in my collection is in the 1934 Boothby which is where I must have found it circa 2007. EUVS has it a year earlier in the 1933 Hollywood Cocktails (third printing, they don't have the other two printings scanned in).