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| Thumbnail | Faked Frequency | Number | Perf | Watermark | Made From | Notes |
 |  | 348 | 12 horiz. | Double Line USPS | Fakes are made from:
343 - Adding horizonal perfs and trimming vertical perfs
343E - Adding horizonal perfs
331 - Trimming vertical perf(s)
331a - Trimming vertical perf(s) | Genuine paste up pairs are often not well aligned and may have a hand trimmed look to them. Guideline pairs may be made from booklet panes, look for watermark. Faked examples of this stamp may exhibit the bright green color of the imperf or sheet varieties. Fakes often have holes that are too small, compare with genuine. |
 | | 349 | 12H | Double Line USPS | Fakes are made from:
344 - Adding horizonal perfs and trimming vertical perfs
344E - Adding horizonal perfs
332 - Trimming vertical perf(s)
332a - Trimming vertical perf(s) | Genuine paste up pairs are often not well aligned and may have a hand trimmed look to them. Faked examples of this stamp may exhibit a light carmine color of imperf or sheet varieties. Fakes often have holes that are too small, compare with genuine. |
 | | 350 | 12H | Double Line USPS | Fakes are made from:
346 - Adding horizonal perfs and trimming vertical perfs
346E - Adding horizonal perfs
334 - Trimming vertical perf(s) | Genuine paste up pairs are often not well aligned and may have a hand trimmed look to them. Faked examples of this stamp may be a light or dark brown color of the imperf or sheet varieties. Fakes often have holes that are too small, compare with genuine. |
 | | 351 | 12H | Double Line USPS | Fakes are made from;
347 - Adding horizonal perfs and trimming vertical perfs
347E - Adding horizonal perfs
335 - Trimming vertical perf(s) | Genuine paste up pairs are often not well aligned and may have a hand trimmed look to them. Faked examples of this stamp may be the bright blue color of the imperf or sheet varieties. Fakes often have holes that are too small, compare with genuine. |
 | | 352 | 12 vert. | Double Line USPS | Fakes are made from:
343 - Adding vertical perfs and trimming horizontal perfs
343S - Adding vertical perfs
331 - Trimming horizontal perf(s) | Genuine paste up pairs are often not well aligned and may have a hand trimmed look to them. Faked examples of this stamp may exhibit the bright green color of the imperf or sheet varieties. Fakes often have holes that are too small, compare with genuine. |
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