unmounted mint Block Larger Than four 1983-87, stamps (4,329), sheetlets of four (336, Reichenbachia) and sheetlets of five (20, Trains), face Guyana $9,974; issues consist of 1983 Burnham, Riverboats, G.B. Stamps, 1985 Georgetown Buildings, Wildlife, Abolition of Slavery, and 1986 Burnham