1. If the stamp has Head Type I and is perforated 13½ x 14¼
with large holes, it is an original. Next check the paper. If it is
printed on quadrille paper, it is either the 1st or 2nd Printing of
Scott #7. Under ultra violet light the frame of the 1st Printing is
a deep red violet; the frame of the 2nd Printing is a pale rose.
If it is printed on thin white wove paper, it is Scott #13.
2. If the stamp has Head Type I and is perforated 13 ½ x 14 ¼
with small holes, it is the Leipsig Reprint. If it is perforated
14 x 14, it is one of the first three Hamburg Reprints which are
difficult to separate without examples for comparison.
3. If the stamp is Head Type II and is perforated 13½ x 14¼
with large holes, it is one of the three Berlin Reprints. If it has
Head Type II and is perforated 14 x 14, it is the 4th Hamburg Reprint.