Guatemala 1871 1c Ocher Gutter Block Printed Both Sides Error Mint. Scott 1b var

Imperforate and printed on both sides, an unused gutter block of eighteen, consisting of two blocks of nine with a vertical gutter in between, printed in a dark shade of ocher. On the reverse of the left block of nine are two and a half vertical rows printed in the regular ocher shade. Normal vertical fold in the gutter and very faint creases through each vertical row. Without gum as usual. A rare error block.