Here is my personal opinion on them:
#1: The Mussel Shell Armor of Apanuugpak (good)
#2: Lawrence of Arabia's Headdress (good)
#3: The Lucky Pillow of Annie Taylor (good)
#4: The Lost Hornpipe of the Pirate Captain (good)
#5: The Secret Map of the Bandit Queen (switch with Catherine the Great)
#6: The Jewel-Encrusted Egg of Catherine the Great (switch with Bandit Queen)
#7: The Metal Beard of the Egyptian Queen (a little lower)
#8: The Levitating Dog Leash of Nostradamus (lower)
#9: The Milk Bucket of Freydis (good)
#10: The Applewood Amulet of Emiliano Zapata (a little lower)
#11: The Lucky Medallion of Atocha (higher)
#12: The Star of Sultan Saladin (a little lower)
#13: The Lion-Headed Bracelet of Chandragupta (good)
#14: John Sutter and the Map to the Lost Gold Mine (definitely higher)
#15: The Discarded Seal of Ivan the Terrible (a little lower)
#16: Galileo's Cannonball (higher)
#17: The Snakeskin Boots of Billy the Kid (good)
#18: The Much-Heralded Helmet of Sir Gawain (good, but maybe a little higher)
#19: The Very Tall Turban of Ahmed Baba (much lower, maybe not even top 25)
#20: The Golden Earring of Henry Morgan (higher)
#21: The Ruby Earring of bin-Zibab (should be where Ahmed Baba is at)
#22: The Priceless Portrait of the Polynesian Girl (good)
#23: The Dragon Lady and the Blue Pearl (good)
#24: The Helmet of Genghis Khan (a little higher)
#25: The Snake Bracelet of Cleopatra (questionable, maybe not top 25)