According to Gibbons, Guernsey Post released this sheetlet from which booklet panes were made as a separate unit that could be purchased on its own. Gibbons does not however assign it a unique catalog number.
Contains: (8 x "Mi:GG 173"; 12 x "Mi:GG 174"; 8 x "Mi:GG 175"; 4 x "Mi:GG 177a"; 4 x "Mi:GG 179"; 4 x "Mi:GG 199") / Gibbons 177a and 177b (both x2).
