[Mount Athos]

I found out these stamps were issued December 12th, 1964, coinciding with the official date that Kenya was declared a Republic.

Therefore they are not evidence that Kenya used "republic of kenya" on official seals dated before december, before they officially became a republic.

http://j-mydland.net/KUT/Kenya.htm

"This series of 5 was issued precisely a year after the first series; 12th December 1964, and was to commemorate the Inauguration of Republic. "

[Red Steel]

Your argument is in noway conclusive.