This set was issued in three formats, hence the C suffix - A was a standard sized home issue, B a standard sized export issue, and C was our large sized set. The first two are very slightly different, so slightly that you need a ruler, for the difference is that the home issue name panel measures 23 x 7 m/m and the export one is larger at 26 x 10 m/m. However I doubt that there are too many collectors who have a mixed or marriage set simply because export sets were and are less plentiful.