What a wonderful find! Have you seen the Singer Domino Cards?
As always, I have a need to research all that I find and nothing turns up. I did find a set in Massachusettes at an Antiquity Museum, but I do think that is an earlier set which was made for Singer to distribute to U. S. soldiers. I believe this set is from about the 1930 era. Someone has taken very good care of them though. Every card in intact and ready to use.
If you have any information about these, or possibly have a wonderful set, please leave a post and let us all know. All of the sewing advertisements are so interesting.