The back is kind of interesting. I have not seen the signature line before, nor have I seen the instruction about "any other writing" on a Valentine card. I guess it's because the card is heavier.

In any event, the sender E. S. H. has figured it all out and done it right.

Addressee: Mrs E. H. Maltison, Wolfeboro, New Hampshire. Posted Oct. 17, 1913.