Steven,
It seems as if information about Breisch-Williams is pretty illusive. Here's a
post from 2004 that you may want to take a look at:
http://www.net54baseball.com/showthread.php?t=65803
While there are no advertisements included in it, issue #4 of Old Cardboard
Magazine contains a 6-page article about the E107 Breisch-Williams card set.
Best of luck to you,
ErikV