This image shows a large formation which has the look of a constructed feature. The large boulder, deposited here and then extensively eroded, is not part of the formation it sits upon.
There is no description on the back of the card.
The large sign affixed near the top of the boulder reads “Balanced Rock  –  Hands Off”. It is not clear what human hands alone could do to affect the boulder, so it can be presumed the hope is to discourage souvenir hunters from chipping away pieces with hammers and such.
This image likely dates from the 1940s.