It has been suggested that Heiser used only their Heiser logo stamp on other companies leather goods, so I wanted to see if that was accurate, and as it turns out, Heiser did in fact use other companies stamps on their leather goods as evidenced here.
If you have any pics or links that demonstrate that, post it for us. Its good to learn more about a company that had a long association with Randall, and made leather products for the old west as well. Great connection.

Links:

http://www.rockislandauction.com/viewitem/aid/58/lid/3534


http://www.vintagegunleather.com/company-marks/hhheiser_history5.html