The unmailed Plastichrome card P332293 has a caption with “Gardens” though we know the place as “Garden”.  More to the point, recent photos of the rock make it look far more precarious than this card does, and there’s plenty of speculation about when it will fall over.  Apparently a twin rock nearby already did — in 1936.  This card has a small reference number written along the upper reverse edge.  Grade: 3