If you have a trading account such as TD Waterhouse or something like that, you can take it to them and they will cash it for you. If you don't have one, you'll probably have to create on.
take it to any discount broker (TD Waterhouse, etc.) and open an account. They will deposit the shares in your account and then you can sell them. I've done it a few times.
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What Company?
Yeah you can pretty much open a brokerage account with anyone (use your current bank) and you can mail the certs (REGISTERED) to them.