The Bond Bread portrait-facsimile from the set of 13 (white borders) was distributed both in stores (for free), and in promo packages with 2 slices of bread during the summer of 1947 (June-July). The exact date of the clipped corners BB card was either the Spring or Fall of 1947. The Old Gold Kneeling in Dugout card was issued in September of 1947.
Regarding the set of 13 - there are 3 backs which help to clear the release date of each. The first card issued was the portrait-facsimile sig. Here's that card:
The next batch of 6 came out between Fall of 1947 and late Spring / early Summer of 1948.
Here's an example of one of those 6 cards:
The last batch of 6 cards came out late Summer of 1949. Here's an example of the back from that batch:
Please forgive my scan quality. I'll be investing in a top quality scanner in the fall and will update them.