Hello, There are several kinds of those notes and prices vary.
As far as a premium for consecutive notes, in my opinion there should be a premium of some kind.
If you could post the Signatures on the notes as well as the serial numbers or ideally a scan or picture it would help with the value.
If your notes have the Signatures of 'Hyndman & Saunders' look to see if written above the left Signature are the words;
"Authorized by R.S.C. Cap. 31" , the value would be more.
Thanks Dave.