This is a complete sheet of 84 US airmail labels. The sheet of labels is 6 across and 14 down. The entire sheet measures 191 by 267 mm (7 1/2 by 10 1/2 inches). The two labels at lower left have additional identifying printing information on them and those two labels are listed as USA-A-26b in the Catalogue of Airmail Labels.
Year: 1973, Gummed. Günter Mair's catalogue no: - USA-A-26b, perforated 12 ½ , 2.label in lower left
position with ref.: "✩ GPO: 1973 O-500-454", bright blue/bright red/white, 3***
Those two labels are rated as SCARCE by the Catalogue. The remaining labels in the sheet are listed as USA-A-26a.
Year: 1973, Gummed. Günter Mair's catalogue no: - USA-A-26a, perforated 12 ½ , sheets of 80(6x14-4)
matt gum, 4 positions per sheet come with advising text for best use of airmail labels on envelopes. But mine
sheet is completely full and not mentioned in catalog, bright blue/bright red/white, 1*