Historical Military Posters and Wartime Flags

Printed wartime material carries its own date. The method used to put ink on paper or cloth belongs to a period, and reading that method is the surest way to tell an original poster or flag from a later copy.

This page treats posters, flags, and printed graphic ephemera as documented categories and concentrates on the physical evidence each one holds. It is a companion to the military photograph reference, and it follows the same rule used throughout this archive: describe the object and how to test it, and never invent a caption, a printer, or a date the piece cannot support.

Posters as printed objects

Wartime posters were a mass medium, produced by governments and agencies to recruit, to warn about loose talk, to sell war bonds, and to raise output in factories and on farms. As collecting objects they are identified less by subject than by how they were printed, and the printing process is a dating tool in its own right. Stone and offset lithography carried most poster work, and full-color designs were built up as a lithographic image in layers rather than from a photographic screen. Letterpress prints from a raised surface and leaves a faint impression in the paper, with a slightly heavier edge to type and solid line. It was common on text-driven notices and smaller printed matter. A poster that instead shows a fine, even grid of halftone dots across its image areas was reproduced photomechanically, which points to a later printing.

Paper itself dates a sheet. Wartime stocks were often economical, made to be posted rather than preserved. They age toward a warm tone and a certain brittleness. Optical brightening agents make paper look bright white under ultraviolet light, and they came into wide use only in the postwar decades, so a period poster does not glow the way freshly made paper does. Institutional collections such as those of the Library of Congress and the Imperial War Museum hold documented, catalogued posters that give a reliable comparison for format, printing, and paper.

Flags and printed cloth

Flags divide first by construction. A pieced-and-sewn flag is built from separate panels of cloth stitched together, with any stars appliqued or embroidered. A printed flag instead carries its design as ink laid onto a single piece of fabric. The construction points to purpose and period, since large ensign and garrison flags were sewn, and many smaller parade and novelty flags were printed. Material adds another layer of evidence, as wool bunting, cotton, and later synthetics each belong to particular eras of manufacture.

For United States flags the star count is a firm dating anchor, because the design changed by law as states joined the union. The forty-eight-star flag was official from 1912 until 1959, so a forty-eight-star flag is consistent with the whole span of both World Wars, while a count outside the documented sequence is a warning sign. The same discipline that governs photographic prints applies here: establish the material and the method of manufacture, and let those set the boundaries of what the object can honestly be.

The reproduction problem

Printed material is easy to reproduce, which is exactly why it needs careful reading. Popular poster designs have been reprinted continuously as decoration for decades, and many modern copies make no claim to be original at all until they change hands a few times. A modern reproduction betrays itself in several ways at once. Digital and inkjet printing lays down its own dot or spray pattern that differs from period lithography, the paper is usually too white and too even, and the sheet often lacks the wear, fold lines, and posting damage that a used period poster carries. A loupe and a raking light reveal most of this quickly, since surface texture and dot structure are hard to fake convincingly.

The honest position is to describe only what the object supports and to name the method rather than assert a specific origin that cannot be checked. Where a printer, a date, or an issuing agency cannot be confirmed, an archive says so. The related note on military patches and unit insignia shows the same manufacture-first discipline applied to woven and embroidered cloth, and the WWII photography reference treats the parallel problem in photographic prints. The archive home page sets out how this archive is arranged and why it favors identification method over unverifiable specifics.