Here are two Clint Eastwood signed cards said to have been signed around the same time.
The first is from a collection that I have marveled at. It's from a NYC based 1950s in-person archive. Most from it were signed "To Joe" as here:

The one below is from another in-person collection said to be from 1954. The heir of the collection claimed on the TV program STRANGE INHERITENCE that the original owner said it was the first autograph Clint Eastwood ever signed for anyone.
This looks off to me. Not fluid like the "To Joe" above.
