This is 3 Antigua Blocks, containing a block of 4 of the SG 27, the 2 1/2d Ultramarine, and two blocks of 6 and 12 of the SG 28, the 4d Chestnut, issued 1887.  These blocks are absolutely immaculate.  They are Mint Gem condition, all with the Crown CA Watermark, valued at L120+ in the Stanley Gibbons Catalog.