I can't tell as you don't show a shot of the top of the lens (flat surface near the mount), but it is probably just shifted to the close focus range, where it won't allow the focus to turn without the adapter ("goggles") in place. If so, there will be a tab on the focus ring positioned like this:
and it needs to be shifted to the normal focus range. To do so pull the focus ring out away from the lens mount so the tab can slip past the stop block:
And then it should turn freely in the normal focus range:
This was one of the best 50mm lenses of the 1950s, and still performs well on digital. In good shape they usually sell for $1K or more.