In my book, it's always time for a valentine or love token, and what a lovely one is this, announcing the giver as "Thine True Love Only"--no small thing! The text appears to have been stamped or block printed, the rest done in watercolor and ink by hand (using hand-cut stencils, which is how theorems were made, and, I recently learned, the paint was often blown onto the paper via a glass tube, like a straw.)  Especially great here I think is the smoke-like trail of ink wash encircling the flowers, plus a wonderful mix of blooms in a range of rich pinks and and purples and deep blue, and great stippled detail on the two urns (see details).  I found this and two similar in Pennsylvania this summer, done by the same person--and unlike any others I've seen. Mid 19th c. I believe.

Paper: 5 1/16" x 3". Very good condition, with the color super strong and rich.