I had looked at these three revenue-imprinted (RN) checks before, but never side by side. The first two are both examples of RN-B5, the revenue imprint being printed in metallic bronze ink. The third is RN-B3 with the imprint in blue.
What I never noticed without comparing them side by side is that the signature of C. C. Parks was not done by hand. It’s printed as part of each check! Very unusual IMO.