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4¢ Washington Head Flat Plate Imperforate |
| Watermark Check - There is no need to check the watermark on this stamp, other than to authenticate (see below), this stamp is double-line watermarked and printed by the flat plate method. |
| Watermark | Scott Number | Privately Perforated by: |
| double-line | 346 | Brinkerhoff I, II, IIa, IIb; International Vending Machine
Mailometer I, II, III, IV; Schermack I, II, III; USAV I, II, III |
see also: Private Perforations - Vending and Affixing Machine Perforations |
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