In 1978, DC Comics teamed up with printer Mark 1 to release a range of superhero-themed greeting cards.

Just another nerd.
In 1978, DC Comics teamed up with printer Mark 1 to release a range of superhero-themed greeting cards.
In 1978, DC Comics teamed up with printer Mark 1 to release a range of superhero-themed greeting cards.
In 1978, DC Comics teamed up with printer Mark 1 to release a range of superhero-themed greeting cards.
In 1978, DC Comics teamed up with printer Mark 1 to release a range of superhero-themed greeting cards.
In 1978, DC Comics teamed up with printer Mark 1 to release superhero-themed greeting cards.
Yes, a Superman greeting card from 1942. This one is basically the cover of Superman #17 with some small modifications. According to the Hakes auction listing for this item, it was a rare promotional item.