Antarctica: British Antarctic Territory: 1998 Antarctic Birds 1p. in a complete plate 1A x 4/1B x 4 sheet of 50 (two panes of 25), folded twice with [R.1/1] of the lower pane showing the inscription error “British Antarctic Terri” instead of “Sheathbill Chionis alba” at top, unmounted mint, fine. S.G. 290, a, cat. £546+, SH 293, v1. Photo. (Image1)