The signature has been authenticated by JSA Witnessed. You can it check out on JSA's website.
Authentic Gucci 221825 Size 7.5 G (US 8.5) Black
Derek Sanderson Memorabilia, Autographed Derek Sanderson Collectibles
Autographed NHL Jerseys – Super Sports Center
Patrice Bergeron Autographed Boston Bruins Adidas Jersey
BOSTON BRUINS DEREK SANDERSON #16 Custom LAB Action 8X10 Mod SQUAD Razor SHARP! $7.99 - PicClick
Lot Detail - 1960s-70s Derek Sanderson Boston Bruins Game-Used Twice-Signed Jersey
Nhl Boston Bruins Greats 15x Autograph Team Jersey
Derek Sanderson Memorabilia, Autographed Derek Sanderson Collectibles
Hunt Auctions, LLC
Derek Sanderson Autographed 2006-07 Upper Deck Trilogy Hockey Boston Bruins Scripts Card – KBK Sports