You don't need a paid subscription to access a massive library of 1950–1970 Westerns. Here are the most reliable platforms:
Internet Archive’s Western Collection – search “Western 1950”. free western movies 1950 to 1970
A goldmine for films that have fallen into the public domain. You can find many rare 1950s B-movies here. Why This Era Still Matters You don't need a paid subscription to access