Perf 10 Horizontally
Vertical or Endwise Coil
Perf 10 Vertically
Horizontal or Sidewise Coil
Watermark Check You must first determine if the stamp was printed using the flat plate or rotary press
method. Note that no offset stamps were issued perf 10. If the 1¢ perf 10 coil is flat plate it does not need to be checked for watermark, it is single-line watermarked. However, if it is rotary press, you must determine if it has a watermark.
|Coil Type||Printing Method||Watermark||Size of Frame||Number|
|Perf 10 horizontally||Flat Plate||Single-line||18.5 x 22 mm||441|
|Perf 10 vertically||Flat Plate||Single-line||18.5 x 22 mm||443|
|Perf 10 horizontally||Rotary||Single-line||at least 22.5 mm high (taller)||448|
|Perf 10 vertically||Rotary||Single-line||at least 19.25 mm wide (wider)||452|
|Perf 10 horizontally||Rotary||none||at least 22.5 mm high (taller)||486|
|Perf 10 vertically||Rotary||none||at least 19.25 mm wide (wider)||490|
The flat plate horizontal coil Number 443 and the rotary vertical coil Number 448 are sometimes faked, since the cost of certification outweighs the value of the stamp. The horizontal coil Number 443 can be faked by trimming the common sheet stamp Number 424 or adding perforations to the imperforate stamp Number 408. The vertical rotary coil Number 448 could possibly be manufactured from the perf 10 rotary sheet stamp by trimming the left and right margins, since the rotary sheet stamp is reasonably common and often well-centered with large margins. However, the fake would not have a watermark. Be sure your Number 448 has a watermark!
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