I think I bought a package of notecards with this design around 1980 or so. I found it in the old set of drawers I threw out.
FROM AN ORIGINAL DESIGN BY MADS STAGE
Mads Stage was a Danish artist who died in 2004. I was sorry to hear that as this is a favourite piece of art of mine.
His designs were used on postcards, stamps, greeting cards and notecards, ceramics, textiles, and books. He favoured birds and animals but also did cityscapes and landscapes, as well as scientific medical drawings.
What a loss, I always loved his artwork. He illustrated Walden, I would love that edition with his drawings, but it is only available in Danish, and is very pricey, alas.