This image is a closeup of the tour boat “Josephine” and it’s owner/pilot, Captain Herb Droste. He promoted his boat and tour services extensively though postcards such as this.
There is no description on the back of this card.
Such cards as the ones shown in the past two weeks were originally photos, which were stamped on the back with postcard markings for stamps, addresses and messages. It was an inexpensive way to take advantage of the postcard craze common among tourists of this era.
This image likely dates from the 1940s.