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[0] unusual, a clarinet with extra keys or if you are selling an A and Bb pair, or if it is a different size [1] no matter the age [2] value hard to determine [3] 
If you don't have any idea about the value, you may join the ClarinetPages forum. Make a post asking for help in identifying the value of your clarinet. Include some good clear close-up pictures in your post, like the pictures seen on this site. The members may be able to help with information and setting a value. Understand that we do not list such items for sale via the forum.
Selling your clarinet - ClarinetPages
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