This series is published by Adelbert Kohn of Philadelphia, PA, copyright 1907. The June card is my favorite. Each card in the series is an embossed horseshoe with the name of the month, the month’s birthstone, and a poem. Both of these cards were postmarked in 1907. I completed the entire series several months ago when I found October at Neplains. It is another internet store to check out in case you need to find that one card to complete your series, like I did!