Georg Jensen Marks: How to Date Danish Silver by Its Stamp
No twentieth century silversmith is faked more often, and none is easier to date once you know the sequence. The Georg Jensen company mark changed shape at datable moments, and the shape of the stamp will usually tell you the decade before you have looked at the design.
Georg Jensen opened his shop on Bredgade in Copenhagen in 1904 and, in the century since, his company has stamped its silver with a small sequence of marks that changed at known moments. That is a gift: where most makers give you one punch that ran for forty years, Jensen gives you a decade, sometimes a five year window, from the shape of a stamp. It is also a necessity, because Jensen is among the most reproduced names in twentieth century silver, and the mark is where the copies fail first.
The company marks, in order
The sequence is the spine of all Jensen dating, and it runs like this.
| Mark | Period | What you see |
|---|---|---|
| GEORG JENSEN in various forms, often with 826S or 830S | 1904 to 1932 | Early hand work, sometimes only the initials GJ, with the low continental silver standards |
| GEORG JENSEN inside a beaded oval, with DENMARK | 1933 to 1944 | The oval arrives, and the country name with it |
| GEORG JENSEN inside a dotted oval, with STERLING DENMARK | 1945 onwards | The modern mark, the one most pieces carry |
| GEORG JENSEN with the ® symbol | after 1945, increasingly late | Registration marks tighten as the brand globalises |
Two supporting facts do most of the remaining work. The standard moved: early pieces run 826 or 830 silver, the Danish norms of the period, and sterling (925) becomes usual after the war, so an 830S Jensen piece is early by definition. And the design number stamped alongside, a number like 100 or 180 or 337, identifies the model rather than the date, but because the numbers were issued roughly in sequence, a low number on a late mark simply means a long running design, which is common and entirely honest.
Designers, and why the name matters
Jensen was a company of named designers, and the name changes the value more than the silver does. Georg Jensen's own work dominates the early decades, with its hammered surfaces, moonstones, amber and the grape and blossom motifs. Johan Rohde brought a severe, undecorated modernism as early as the 1910s. Harald Nielsen carried the house into Functionalism in the 1930s. Henning Koppel, from 1945, produced the flowing organic forms that made the company famous a second time, and Nanna Ditzel, Vivianna Torun Bulow-Hube and Bent Gabrielsen followed. Later pieces often carry the designer's initials or full name beside the company mark, and where they do, that is the first thing a buyer should read after the oval.
Fakes, copies and the honest imitations
Three different things travel under the Jensen name and only one is fraud. Period copies exist because the style was widely imitated in Denmark and abroad, in silver, honestly marked with their own makers' punches, and these are perfectly collectable as what they are. Modern reproductions of famous designs are made and sold openly. Fakes carry a forged Jensen mark, and they fail on the same points forged marks always fail on: the punch is soft or slightly wrong in its letterforms, the oval is the wrong shape for the standard claimed, the country name is missing where it should not be, or the mark is crisp while the piece around it is worn. Compare against the general rules for fake marks and, in particular, distrust any combination that mixes an early standard with a late oval.
Judging a piece beyond the mark
Jensen silver is heavy and finished to a standard that copies rarely reach. Look for the crispness of chasing on foliate models, the weight in the hand relative to size, and the quality of the clasp or pin, which on genuine work is engineered rather than merely attached. Stones are usually the house materials, moonstone, amber, lapis, chrysoprase, carnelian, set with the same confidence as the metalwork. Patina is expected and desirable, and the usual silver care rules apply with force: hammered and oxidised surfaces are ruined by aggressive polishing, and a Jensen brooch stripped to a uniform shine has lost the contrast its designer drew.
Frequently asked questions
How do I date a Georg Jensen piece?
Read the company mark first. Pre-1933 pieces carry various early stamps, often with 826S or 830S; 1933 to 1944 uses a beaded oval with DENMARK; from 1945 the dotted oval with STERLING DENMARK is standard.
What does 830S mean on Georg Jensen silver?
830 parts silver per thousand, the Danish standard of the period, with S for silver. It indicates an early piece, since sterling at 925 becomes the norm after the Second World War.
What is the number stamped on Jensen silver?
The design number, identifying the model rather than the year. Numbers were issued roughly in order, but popular designs ran for decades, so a low number with a late mark is normal.
Are there fake Georg Jensen pieces?
Many. Forged marks usually betray themselves through soft or wrong letterforms, an oval that does not match the claimed standard, a missing country name, or a crisp stamp on a worn piece.
Does the designer's name affect value?
Considerably. Work by Georg Jensen himself, Johan Rohde, Henning Koppel, Nanna Ditzel and Torun commands more than unattributed house models of the same weight.
Should I polish Georg Jensen silver?
Only gently. Hammered and deliberately oxidised surfaces depend on contrast, and heavy polishing flattens the design permanently. Wash, dry and leave the darkness in the recesses.