1c Denomination in Numerals Imperforate Washington Postage Stamps

	Denomination in Numerals 1 CENT Imperforate
Scott 408 Flat Plate		Scott 531 Offset

Printing Method and Watermark Check - You must first determine if the imperforate stamp was printed using the flat plate or offset method; the 1¢ rotary press imperforate stamp was not issued. If the stamp is offset, it does not have a watermark. If it is flat plate, you must check for the presence of a watermark.

Printing Method	Watermark	Scott Number	Privately Perforated by the Following Companies/Types
Flat Plate	Single-line	408	Brinkerhoff I, II, IIa, IIb; Farwell 4A, 4B, 4A5, 5A4; International Vending Machine; Mailometer I, IV; Schermack III; USAV I, II, III
Flat Plate	none	481	Schermack III only
Offset	none	531	Schermack III only

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