I know my post looks a bit rushed, but if Kenya had an independence day in December 1963 I’m pretty sure they could’ve had a seal by February 1964.
I wish I had said Kenyan references in the title, but I’ve never done this before.
They actually decalred themselves a Republic in December of 1964. The issue would be whether they knew that was coming and created the Republic of Kenya stamps/titles/etc. beforehand.