Here are two retro valentine printable envelopes. The first envelope has an illustration of a young artistic girl with a palette of paints in her hand. There is a white space for the name of the recipient on one side of the envelope and a pink heart with the message “with Love” on the other side. The background of the envelope is a red and white checkered design.
The second envelope includes an illustration of a young boy dressed as an engineer driving a train that is pulling three cars filled with hearts and flowers. There is a large heart on one side of the envelope that is designed to be used for the name of the recipient.
The extended edges of each envelope indicate where to fold and paste to create envelopes from the printable illustrations. I scanned the envelopes from a valentine book that was published in the 1940s; it was not copyrighted
Click on image to enlarge.