Great Britain - QV (surface printed) : (SG 489b) 1941 21/2d light ultramaine tete-beche horiz pair

Great Britain - QV (surface printed) : (SG 489b) 1941 2½d light ultramaine tete-beche horiz pair mint, full original gum, with Brandon(2014) photo certificate stating geniune "toned". Without toning this would be a £10,000+ item and one of the UK rarest varieties. Estimated accordingly Cat £18000 (image available) [US4]