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As an owner of a 432, I can honestly say $0. Most people can't give them away. Enjoy this wonderful little organ, but don't treat it as a business investment. It will be a money pit. Enjoy.
If it's a Conn trumpet, it's the model number. The Conn 20B is a student model horn.
50-100
50-100
10-250 USD or so
Model - Sport King Made from the 50s to the mid 70s
1800-1900 bucks
$150-$300, depending on EXACT model and condition.
That doesn't look like a serial number. I'm not an expert on clarinets, but I think in this case the 424N is the model number and the serial number proper is the part starting with B, which according to Conn's websitehttp://www.conn-selmer.com/en-us/about/customer-service/serial-numbers/conn/puts it in the early 1960s.To get an estimate of the value you'd need to take it to a dealer.
AROUND $300, depending on which model and condition.
250 - 350 depending on precise condition
since Winchester will no longer make this model.. i would venture to estimate the value at $1000.00 or more.. just think, awesome firearm with no problem adding a scopeAnswerMore like $350 if 100% new.