Postcard - Mercer Island, Washington

"Mercer Island, convenient to both downtown Seattle and Bellevue is the largest island situated in a lake on the west coast. It is connected to Seattle by the Mercer Island Floating Bridge and to Bellevue by the east Channel Bridge. It is five miles long and from one to three miles wide."

1970s or early 1980s. Also includes Mount Rainier and Lake Washington.