I would get the Mets team ball signed and a single signed baseball . I would not do the pitching rubber because I have not had good experiences myself in the long term with pitching rubbers being signed, I have found that they fade rather quickly compared to other items. This has happened to them for me even if I did not expose them to light or display them out.
As far as investment get them signed because you want them in your collection because your ROI on these will be little or nothing in the short term and long term .
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