Mantle opinion needed please
 

I purchased this card long ago, before PSA (or grading/authenticating at all for that matter) became big. I believe from what little I could find online that this company, ASA, even merged into or was bought out by PSA. I had a hard time finding anything about them at all, save for an old post on a forum board that was made by a person that I believe is also a member here. There is not much in the way of presentation on the flip but I included pictures of the front and back as well as a close-up of the signature itself.

My eye is not well trained enough to catch the inaccuracies of Mantle's widely-forged signature. Regardless of the slab it is in, I know there are experts here that can chime in on its authenticity based on the merits of the signature alone. Any insight is EXTREMELY appreciated!

:):):):):):):):):):):)

That is such a relief to see! Thanks Shelly!