This series of cards are from the earlier days of postcards, where photographs were printed on heavier stock and stamped on the back with a generic Post Card imprint, showing where to write the address and personal note.
The next few cards show a remote area of northern Michigan’s lower peninsula called Northport Point. The area is at the extreme north end of the Leelanau Peninsula so it is usually visited deliberately and not on the way somewhere else.

The caption states:
Sandy Beach & Drive at Northport Point – com b
The last few letters in the caption are probably sequence numbers for the postcard collection.
This postcard was used, and is postmarked June 1939.