A hallmark adds value only when it verifies: a documented mark from a known maker, on a piece whose construction matches that maker's era and habits. Unsigned is normal — per Hougart, individual signing began only in the 1920s and most makers stayed anonymous until after World War II — so a missing mark subtracts nothing from early work, and a famous mark on the wrong piece is a warning, not a premium.
Why most old work is unsigned. Hougart's front matter lays out the history: although tribal and clan symbols are ancient, "only since the 1920s did a few individuals begin to identify themselves on their silver craft," and up to and shortly after World War II most jewelry-makers remained anonymous to non-Native consumers. Cultural norms ran against self-promotion — artisans of great merit "would have found the signing or marking of their work inconceivable" — and, notably for attribution, competent women silversmiths often used the stamps of husbands or relatives, their identities staying unknown to the outside world. (Hougart 5e, front matter) The practical consequences: pre-1920s work is unsigned by default; a mark on a piece whose construction says 1890 is an anachronism; and even a genuine mark may not name the actual maker. See Unsigned and Unmarked Jewelry for attribution-by-style.
Where marks came from. Systematic marking arrived through institutions, not individuals. The Indian Arts and Crafts Board's program put teeth in it: standards approved in 1937 required that government-marked silver meet weight, design, and workmanship requirements "in accord with Indian usage and custom," with numbered dies marked by tribe name — Navajo, Zuni, Hopi, Rio Grande Pueblo — and dealers held responsible for violations in silver bearing their mark. (Hougart 5e, ~IACB section) Guild and cooperative stamps followed the same logic: the mark certified a standard, not just a name. The full institutional story is at The Hallmark Story and The Guild Story; U.S. NAVAJO-stamped pieces and their kin are era artifacts in their own right.
What a verified mark is worth. Attribution. A documented hallmark ties a piece to a person in the record — their nation, period, techniques, and standing — which is precisely what the 550-artist directory behind the hallmark identification guide exists to support. Attribution concentrates demand: collectors of a particular artist compete for a finite body of work. But the mark is the beginning of verification, not the end: the construction, techniques, and materials must agree with the attributed maker's era. A mark can be applied to anything — which is the next problem.
Forgery and shared stamps. Marks of collected artists get forged; the documented cases and detection logic live at Fake and Forged Hallmarks. And forgery has deep roots in the region's history — Bedinger records that when government-issued stamped metal ration tokens circulated in the early reservation era, "the clever Navaho craftsmen made dies and again forged them." (Bedinger 1973, ~p. 18) Add the documented shared-stamp practice — family members, spouses, and shop hands using one mark — and the rule writes itself: the mark opens the question of attribution; the construction answers it.
Reading marks: How to Identify Hallmarks · Initials Lookup. No mark: Unsigned Jewelry. Bad marks: Fake and Forged Hallmarks. History: The Hallmark Story. Value context: Is My Turquoise Jewelry Valuable? Artist-attributed, mark-documented work is at tskies.com →