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[0] as above plus vintage Conn 424 [1] but if it is from before 1980/1970 [2] not reconditioned, perhaps as much as $300, if reconditioned perhaps as much as $1000 [3] 
You will probably get the best price by first having the instrument reconditioned. See Recommended Clarinet Tech Services. I give pointers below for selling on eBay or other sites like Craig's list.
Selling your clarinet - ClarinetPages
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