How much is a 1871 4 skilling worth?

A tray I have is non-magnetic which makes me think it is sterling silver. How do you determine if something is silver plated or sterling silver? Where can you buy a diary with a key? What is value of 1957 Stan musial 476? What does ms65 FB mean for coins? What is the difference between kj and kcals? What is a bottle of Old Douglas Bourbon whiskey from 1936 worth? How much is a two pound coin worth with an r stamped in the middle of a queens head year 2001? What is a herbert schmidt gun? How much is a 1946 ''canadian'' penny worth? Why did you come into town today? What is what are your hobbies in welsh? What is vg-8 in coin collecting? Do they still make purple passion and where can i get some? What is the value of a 1991-92 Upper Deck Gary Payton card? Is hockey fake? What is the value of an 1845 Canadian dime? How much are 1958 baseball magazines worth? Does 'collectible autograph' mean the autograph is real? Is a sand dollar cold-blooded? I have about 100 gold stamps from Calhoun's Collectors Society Kings and Queens of nations of the world US commemorative first day cover what are they worth and how do I sell them?