Michael J Fox Signed Funko Pop PSA Slabbed Certified #957 Marty 1955 B Posted on September 10, 2023 by admin Michael J Fox Signed Funko Pop PSA Slabbed Certified #957 Marty 1955. Pop is hand signed and authenticated by both JSA and PSA. FUNKO is Slabbed Certified by PSA in their new. Share