The card will provide you a spell of entertainment trying to guess the date of the photo. The card is a real photo on card stock. It is impressed Gardner Photo. The school desks appear to be late 19th or early 20th century. The school childrens' dress appears to be later. We can say it isn't from the South and we can also say probably rural. I will not give you my clues, you should find your on clues without influence.
postcard is in very good condition with slight edge fading & oxidation (like it might have been framed) and the slightest of edge wear. It was never mailed but has a couple of pencil marks on the back. Back is yellowed with age, but even.
Postcard: Photo: School Classroom with Children