This image shows the collection of boats available to visitors staying at the H&H Resort on Drummond Island.
The L.L. Cook Co., Milwaukee, WI
The description simply states:
804V
H & H Resort, Drummond Island, Mich.
The resort is a campground and marina for visiting boats and boat rentals for tourists visiting the island. It continues to operate today, including the same moorings seen in this picture.
The card is dated 1961.