The best info I could find on early Bowman salesman strips were from this Topps Archives blog post:
http://www.thetoppsarchives.com/2010...les-force.html
There is a similar post regarding early Topps salesman strips (the Topps salesman strips definitely have characteristics unique from production cards).
http://www.thetoppsarchives.com/2010...p-show_07.html