Your mint mark is normal, I can see why you would ask, it does resemble a doubled MM, but as mentioned, it is a contact mark .
Below is a link to some 89RPMs
http://www.varietyvista.com/02b%20L...%201989D.htm
Below is a link to some 89RPMs
http://www.varietyvista.com/02b%20L...%201989D.htm























