Investigation of old postcard

I found this lovely postcard while reading "Peter the First". It`s postcard for International Women`s Day from 1976. As I got the book in library`s give away book shelf, I have no idea about the people postcard was addressed to.

Sender is a man and receiver is two women. It means that those women were living together. Maybe mother and daughter, maybe two sisters? There isn`t an address in address field. Maybe postcard was put in an envelope?

I know that in those years it was common to give a postcard (or greeting card) with a present. So it could be possible that postcard was attached to "Peter the First" and this book was a present in International Women`s Day. Oh, people gave books as presents those days more often than now... But! Man and women weren`t living together, because sender has written: "I`m waiting for your letter". So my presumption is less possible, if only he sent a parcel.

What else is written on the postcard:

Z. and D.! Greetings in lady`s most splendid Day! Be always beautiful and joyful! A.L.

(Didn`t wrote the names, because it doesn`t matter.) Nice. He definitely kept warm feelings in his heart about them.

Such finding make me think about love and relationship and past as well.