I have a load of hockey memorabilia [habs stuff included] so it's hard to pick just one.
If my house was on fire and I could only grab a few things I would take all my Maurice Richard autographs. I have 5 total, a card, photo, puck, hat and jersey all signed in person at various times through the 90's. Although my jersey would be safe, my dad has had it displayed behind his bar for the last 2 years and he always finds new and creative excuses to leave it there.