Can someone help me ?

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Can anyone tell me about this ? any info would be great.

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It's a $4 note of the third and final issue of the Agricultural Bank, Toronto, dated 1 Oct. 1837.  It is fairly common and has a current catalogue value of only $70 in Very Good condition.  Your note, given its fragile condition, unfortunately has practically no value.  The bank failed in 1837 so it is no longer redeemable.  You might like to keep it as a curiosity or donate it to a young collector, but you can't really expect to get much out of selling it.  Sorry about that! 
There is some history of the bank and its notes in earlier numismatic literature if you want to follow it up.

Thanks Bob, I found it in a box in my house here in England and didn't expect it to be worth much. But was interested in its history. I wish i knew how it got there but guess i never will but will look in to it further and who knows might start me collecting