This is a 5 and 1/4 by 3 and 1/2 postcard in grayscale from the studio of Eastern Illustrating Co., Belfast, Maine. The caption on the front of the card reads, "Main St., Southwest Harobor, ME. 30"/
It is a photo of the corner of Clark Point Road and Rt. 102, looking towards the Masonic Building.
“Postcard of Main Street, Southwest Harbor,” Mount Desert Island Historical Society, accessed November 21, 2024, https://mdihs.digitalarchive.us/items/show/5172.Item 5538