I'm going to add this to zipper's thread, I sure hope she doesn't mind!
Today isn't Valentines Day. But as I tell my wife, EVERY day here is Valentines Day (That's why I never buy her anything. You can guess how that goes over!) But I purchased this early 1870s envelope recently (can't tell if the stamp is a 134 or a 145 or a 156. The target cancel is covering the pearl where the secret mark is, and I can't find any of my magnifying lenses). It's got a nice frilly cover and is postmarked on February 14 in Franklin Mass.
You can see the envelope is very similar to zipper's shown above. It's quite substantial, but when I looked inside, this is what I found
This little embossed messenger of love measures only 2.5 inches top to bottom. I hope Miss Ada got some chocolates as well!
My great grandmother had a shoe box sized box of this type of cards and other embossed items . She used to let us kids look at them. About ten years after she passed I ask the family where the box went. I was horrified to hear they were burned when the house was cleared. Every one thought they were useless junk. It is a shame that too much of her time like the gets trashed.