3¢ Washington Head
Flat Plate

Type I Flat Plate
Double-line Watermarked

Type I Flat Plate

Type II Flat Plate

Watermark and Type Check - The flat plate stamp must be checked for watermark. If it is double-line watermarked there is no need to check for anything else, the stamp is Number 345. If it is unwatermarked, it can be either of two types, type I or type II. Note that unlike the 1¢ and 2¢ stamps the 3¢ flat plate imperforate is not found on single-line watermarked paper. Many of these stamps were privately perforated.

Watermark Type Number Privately Perforated by:
double-line I 345 Brinkerhoff I, II, IIa, IIb; International Vending Machine
Mailometer I, II, III, IV; Schermack I, II, III; USAV I, II, III
none I 483 Mailometer IV; Schermack III 
none II 484 Schermack III only

see also Private Perforations - Vending and Affixing Machine Perforations

Types of the 3¢ Flat Plate Washington (Types I and II)

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