Guernsey Post Faststamp - Guernsey Flag 16 September 2015
introduced their Post and Go machine GG01 at Spring Stampex 2015 with a machine dispensing on one roll the Guernsey Flag stamp and on the other Royal Mail's Union Flag stamp.
At London's Autumn Stampex the Guernsey Flag stamps were sold with an additional inscription:
HM The Queen
This is a single Guernsey Post plain Flag Faststamp at the GY Letter 100g rate