King James Bible published (traditional date) (2-1-1611)

Why "traditional date"?
Because the KJV was classified as a revision rather than a fresh translation, it does not appear in the registry of new books known as the Stationers' Register....we are left without any knowledge of when in 1611 the KJV began to be sold....
- Gordon Campbell, _Bible: The Story of the King James Version 1611-2011_ (quoted by Crystal)
It was not a fresh translation because it often continues earlier translations such as that of Tyndale and Coverdale (see 20 January).
But we are left without any knowledge of the whence and by whom of the May 2 "myth".
Stationers' Register may tell us nothing, but we do have considerable documentation about the printers who worked on it.
This brings to mind an a.u.e. discussion in 2017 where I found the following:
"The original printing of the Authorized Version was published by Robert
Barker, the King's Printer, in 1611 as a complete folio Bible....Robert
Barker invested very large sums in printing the new edition, and
consequently ran into serious debt, such that he was compelled to sub-lease the privilege to two rival London printers, Bonham Norton and John Bill.
It appears that it was initially intended that each printer would print a portion of the text, share printed sheets with the others, and split the proceeds. Bitter financial disputes broke out, as Barker accused Norton and Bill of concealing their profits, while Norton and Bill accused Barker of selling sheets properly due to them as partial Bibles for ready money. There followed decades of continual litigation, and consequent imprisonment for debt for members of the Barker and Norton printing dynasties, while each issued rival editions of the whole Bible....
https://en.wikipedia.org/wiki/King_James_Version
I'll stick with the mythical-traditional date.