These are left over Post Cards from BSA to notify customers of an Open House.  As near as I can tell, they are from 1961 give or take a year. This was a year or two after my father took on BSA as a brand.  I am asking $3.00 a piece for them and will sell 4 for $10.00. This is a neat nostalgic item. They are mostly in excellent shape but some of them may have a little oil stain in one corner.  The size is 4 3/4" x 7 1/2". I will cover shipping.