PSA Slab Stress Marks? Or has slab been tampered with? 1959 Mantle PSA 6
![Counselor](https://w3.vanillicon.com/3f816ae48c00dfdaf0bcf754ad45e635_100.png)
I am thinking stress marks, but want to make sure. Bought on ebay a couple years ago and recently noticed the marks on slab.
Thanks
Brian
![image](http://i746.photobucket.com/albums/xx108/brian29575/img192_zps18c5e3e1.jpg)
Thanks
Brian
![image](http://i746.photobucket.com/albums/xx108/brian29575/img192_zps18c5e3e1.jpg)
![image](http://i746.photobucket.com/albums/xx108/brian29575/img193_zps2c279b60.jpg)
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PS: nice 6!
Love the beckett holders. Saw a video of a guy dropping his bgs in the toilet then running it over with a truck...card was just fine