These icy, snowy days make for some good Etsy listing time. These delicate cards (found in my shop here) date from the early 1900s, most of them manufactured by Whitney Made in Worcester, Massachusetts.
Did you notice the boat is heart-shaped? (edit -- two below sold!)
These are intricately die-cut and 3-dimensional. The lacy part stands up and there are more embellishments layered on top. (This heart-shaped one below has sold!)
This one is marked Germany and is a standing pop-up. Love the sweet red honeycomb at the bottom. (edit -- sold!)