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6 cuartos
Forgery 2
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  I've been trying to come up with a list of characteristics to help distinguish a genuine 6c from a forgery. But there hasn't been, at least to my knowledge, a problem with forgeries for this issue. The modern day photographic forgeries on thin paper are about the only ones that might fool someone, and only because they are replicas of genuine stamps.

The one detail that seems to be lacking in all the forgeries I've seen is this:

The background mesh is comprised of horizontal and vertical crossed lines. There is a thin white gutter between the central area of corssed lines and the outer frame. Some of these crossed lines that form the background mesh extend beyond the confines of the central area into the thin white gutter (detail). There are some extended lines that are consistant on each and every position in the plate, such as the 2 lines just under the numeral 6 in the top inscription (detail) and others are unique to particular positions. Some are not as distinct as others, but every 6c will have some. The modern forgeries also show some of these lines, but they are not as distinct.

There is also a small "knob" of black color in the upper left corner of the central design area, that protrudes into the thin white gutter (detail). It seems to be missing on most forgeries, with the exception of the photographically produced replicas of modern times.

 This "forgery" is not exactly what I would call a "forgery". It appears to be cut out of one of the Spanish Centenary issues of 1950, or possibly a photocopy of the stamp in black (None of the issues in the Centenary set were actually printed in black!) and then cut out. This one was being sold on ebay as a genuine unused stamp.

None of the background lines extend into the white gutter, nor does it have the black "knob", as described for a genuine stamp. The line that forms the throat, running from the chin to the bottom of the base, is a continuous, inward curve. On a genuine stamp, that same line would curve sightly outward, then curve away sharply to the left. (comparative detail)