This image shows the base and marker identifying the Monarch White Pine. At the time it was one of the largest white pines in Michigan.
The description states:
THE MONARCH PINE
One of the largest white pines in northern Michigan, located in Hartwick Pines State Park, Grayling Michigan. 155 feet tall and 51 inches in diameter.
–This tree no longer exists, as it was damaged in a storm and died shortly thereafter. There were earlier posts on this blog about the Monarch here.
This card is dated 1955.