This is the King Dick adjustable spanner included in the MGA tool kit. As original from tool kits in MGA production cars Nov 25-26, 1957, Dec 31, 1958.

Some of these also have "KING DICK" in raised lettering on the flip side of the handle, but not this one. I can only guess that the one printed on both sides was later issue, and I have no idea when (yet). Feedback from people with known issue date tool kits would be appreciated.