Perhaps it's a note from the edge of the sheet. Does any one know (and is it knowable) where the note was located on the sheet?
My guess is yes it would be printed on the edge of the sheet. Left or Right Side, not sure.
Beattie/Rasminsky notes should be printed 1961-1971. From 1956 to 1968, notes were printed in sheets of 32, from 1968 on they were printed in sheets of 40.
If note 0184327 was printed on a sheet of 32, the position should be seventh row, first column (G1), left side of sheet. If printed on a sheet of 40, the position should be, fifth row, fifth column (E5), right side of sheet.