[brandoningram]

I am going to appologize if this post has been around already...I actually searched, and couldnt really find anything on the topic.
I am in the process of purchasing a Heydler baseball ( with Cork & Center around "Official"), and the seller states that it does not have the Heydler stamp.
My question; Why do some 1900-1934 OAL/ONL balls not have the Pres stamp? Obviously they wont be as valuable, but how less of value? And any other info that pertains to this...