TOS/TAS Shuttlecraft....

[Warped9]

Admirredly reusing the shuttlecraft miniature as is makes sense from a cost saving standpoint, and that the different markings wouldn’t be truly noticeable viewed from a distance (and on a small television screen).

 

[Maurice]

Possibly the big number decals for the 11-foot model’s upper saucer.

I don't recall it being those letters or numbers, but I can't be sure.