Not really. Movie ratings as we know them began in the late 60s. That's when my father figured out the G & PG ratings and I was doomed to G rated movies until I was old enough that my friends and I could drive ourselves to movies.
Basically, I suspect someone at Prime is rating old movies to make them compatible with modern movies. That's my story, and I'm sticking to it!
Google says this about the movie's ratings:
- MPAA Rating: Not Rated (NR) by the MPAA (though historically approved in 1955) Common Sense Media
- Common Sense Media: Recommended for ages 13+ (due to adult themes and historical context) Common Sense Media [1, 2, 3]