Is there a reference source for US Stamp designers?
Is there a repository somewhere that lists out the people involved in the design, lettering etc for an individual US stamp. This example of Captain James Cook (Scott 1732) FDC that I am looking at appears to be signed but how do you know if they are correct? I realize the example shown is not in great shape with a glue remnant from an old label and some smudging of the word Vignette but it spiked my interest in the likely sources available to confirm these names are correct (I realize there is no way to confirm the signatures are genuine!)
Thanks in advance for any feedback