This is an Antigua 1890 Provisional Usage in St. Christopher of the SG 26 1d stamp.  While it was certified as noted by the number above the stamp, the certification slip is sadly missing.  Please see the footnotes after the last stamp in St. Christopher in the SG and Scott catalogs for more information!  This stamp is in absolutely stunning condition!

This is valued at L120 in the Stanley Gibbons Catalogue and $140 in the Scott Catalogue!