Thanks for those who commented on the question regarding the 1970 border. Here are a few films in no particular order.
The Sea Hawk
First is the Classic 1940 movie The Sea Hawk starring serial rapist and cocaine fiend Errol Flynn. Originally it's a black and white film but at some point they put a splash of colour into it and that's the version I had on VHS for years. It's just a great swashbuckling action film about power in the 16th century.
Rear Window
Rear Window from 1954, one of Hitchcock's best films, is a natural classic. There is also something about 1950s technicolour that I just love. Speaking of love, any film with Grace Kelly is a must watch. Just look at her. It's nuts that anyone could look this good.
The Third Man
The Third Man from 1949, starring Orson Welles is another great film. What I like about it is that it relies on the imagination of the viewer to portray horror and not props and prosthetics. In one scene you only see the reaction of the actors as they view the horrors of deformed children.
F for Fake
Speaking of Orson Welles, and yes, I know it's three years past the boundary, but his 1973 film/documentary F is for Fake is a great watch. But be warned, if you want to watch it, I HIGHLY recommend doing it without reading anything about it first. It's one of those rare films that benefit from not knowing about it too much before hand.
Paths of Glory
All of Kubrick's films are naturals for viewing, but I'd like to mention one that often gets neglected a lot, the WWI flick Paths of Glory starring Kirk Douglas. It's one of those films that are filled with many cinematic innovations that have since become staples, such as having an actor walk towards the camera while the camera man walks backwards.
Well, I'll let that do for now.
Edit: How do you get these moviedb links to show a synopsis in a box and not just a text link?