Fully zero technological pattern (accept).
Not only is its numbering zero, but also the series letters on this pre-production pattern are replaced by zeros.
Marked serialized pattern in the field on the left margin.
Minimal double overstamping in the field, but very mild and only a few calluses. A small spot at the top, in the margin, and otherwise no comments.
Very rare, only single notations of 1948 issue patterns of this type can be found in the archives.
