I have a set of 6 black and white cards [[measuring roughly 2-1/2" x 3-3/4")
of various pictures of the Supremes.

I am trying to determine where this set of pictures came from. They are similar to a playing card and there is a picture on the front and a different picture on the back. I assume the set consisted of only six cards.

One card had 4 Supremes in the picture and all others had 3. Another one shows them looking at a shopping basket full of White Bread and another has them dressed in nuns outfits.

The only identifying information on each of the cards is:
5381MC2 [[C) Motown Record Corporation Printed in U.S.A.

Anyone have any information on the source of these cards? They were given to me as is. Thanks for any help.