Can anyone check these movie posters that I found in my Grandfather's house are authenticate?

JakeMovie

They're pretty old, but you never know 🤷‍♂️

 

Charlie

Look pretty authentic to me at first glance... Don't have time to study them close right now.

HONDO

On what I see with their condition they do look original printed posters to me.

jayn_j

Look like authentic insert posters, mostly first release.  However, they are theater used, which tends to lower value.  Most are for titles that are not overly collectable.  The exception is the Jaws one.  You can get an idea of value in the archive section of emovieposter.com.

Rick

They look real. The best title is Jaws, though it is quite damaged which is a pity.