DOMINICA 1951 New Constitution 8c blue-green and blue error, SG137a

Dominica 1951 New Constitution 8c blue-green and blue, left marginal block of four, lower right stamp showing wmk error 'JA' for 'CA', SG137a.

Pristine quality positional block, unmounted mint with full original gum.

A rare watermark error, particularly rare within such a fine quality marginal block of four.

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