I think Elvis clearly didn't sign this.
It was my impression too.. It has a letter by Marty lacker who was a friend and worker... Lots of the Memphis Mafia are notorious for selling on fake stuff.. It doesn't look like a 70s to me..I could be wrong.. Dave hebler another helper sold a shirt and was proven to be fake from the date he stated. It was on a TV show where he admitted it...
Found this one, looks very close, and I don‘t think that both are real.
The Y is a joke. I doubt this is authentic.