 |  | 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. |