CSA Catalog 7-L-v2, 5¢ light blue top right sheet margin block of 20 showing listed DOUBLE BRASS RULES at top as well as a trace of unlisted brass rules at right. Click here to read ground-breaking article by Kevin P. Andersen and Patricia A. Kaufmann on this catalog-changing topic in the Confederate Philatelist that explains what it is all about. Full original gum with two stamps hinged and all the rest never hinged, some creasing and edge wear. Click here to see the back of the block. Not listed in Scott, nor will it be, as they feel it too specialized for Scott (a more general catalog) and leave it to the CSA Catalog. Variety as a top row single catalogs $125 (thus $1,250 as singles for top row alone) and $950 for a block of 10 (5x2). This is double that with the addition of A brass rule at right (not yet cataloged but doubtless will be in future editions) as well as outer frame line filled in with in (7-L-v4). A rare and spectacular multiple. $1,500.