NumisHammer indexes historical and contemporary numismatic auctions across 320+ international auction houses and 15,000+ cataloged sales—covering Ancient Greek, Roman Republican, Roman Imperial, Byzantine, Medieval, and Modern World Coinage with high-resolution 1800px WebP imagery.
Preview how NumisHammer structures each numismatic lot with extracted metrological data (metal, weight in grams, diameter in millimeters, die axis), third-party grading certifications, catalog citations, starting bids, and final hammer prices realized.
Helmeted head of Athena right, with frontal eye / Owl standing right, head facing; olive sprig and crescent to upper left, ΑΘΕ to right; all within incuse square. Cresting full strike on sound metal.
CAESAR AVGVSTVS DIVI F PATER PATRIAE, laureate head of Augustus right / AVGVSTI F COS DESIG PRINC IVVENT, Gaius and Lucius Caesars standing facing, shields and spears between them; simpulum and lituus above.
LIBERTAS, bare head of Libertas right / BRVTVS in exergue, the consul L. Junius Brutus walking left between two lictors bearing fasces, preceded by an accensus. Rome mint.Cabinet toning.
D N IVSTINIANVS P P AVG, helmeted and cuirassed bust facing, holding globus cruciger and shield decorated with horseman / VICTORIA AVGGG Θ, Angel standing facing, holding long cross and globus cruciger; CONOB in exergue.
Crowned royal monogram of Christian VII / Sailing ship under full sail left, date below. Certified and encapsulated by PCGS with original colonial cabinet patina.
Crowned Pillars of Hercules over waves, L-8-M / P-V-A in तीन lines ("Plus Ultra"), full clear date 1714 below / Jerusalem cross in quadrilobe with castles and lions in angles.
NumisHammer automatically parses auction lot descriptions to extract rulers, issuing authorities, mints, metals, metrological data, and cross-references across the world's standard numismatic literature.
Archaic, Classical, and Hellenistic issues from Magna Graecia, Sicily, Macedon, Attica, Ptolemaic Egypt, the Seleucid Empire, Bactria, and Celtic tribes across Gaul, Britain, and the Danube.
Aes Grave cast bronze, anonymous and moneyer denarii, quinarii, and aurei from the early Republic through the Imperatorial Civil Wars of Julius Caesar, Mark Antony, Brutus, and Octavian.
Imperial coinage from Augustus to Romulus Augustus across Rome, Lugdunum, Trier, Antioch, and Alexandria—including aurei, denarii, sestertii, antoniniani, solidi, and Greek Imperial civic bronzes and tetradrachms.
Gold solidi, histamena, hyperpyra, silver miliaresia, and bronze folles from Anastasius I to Constantine XI, alongside Ostrogothic, Visigothic, Lombardic, Umayyad, Abbasid, and Ottoman dynasties.
Carolingian deniers, English hammered pennies and nobles, Italian florins and ducats, German States talers, Spanish cob and milled 8 reales y escudos, and French royal écus and louis d'or.
16th–21st century sovereign world coinage, colonial issues, pattern strikes, trade dollars, commemorative medals, and coins graded by PCGS, NGC, and ANACS on the Sheldon scale (MS60–MS70, PF/PR).
Unlike generic auction aggregators, NumisHammer is engineered specifically for numismatic metrology, die comparison, and market valuation.
Every indexed lot is automatically analyzed to isolate metal composition (AV, AR, AE, EL, BI), exact weight in grams, diameter in millimeters, die axis (1h–12h), and Sheldon or European grading tiers.
Original auction plates are archived at up to 1800 pixels width with proportional height in lossless/high-fidelity WebP format, preserving fine die breaks, overstrikes, mintmarks, and edge details.
Compare opening estimates and starting bids against final realized hammer prices and bid counts, including transparent tracking of passed/unsold lots to evaluate true market liquidity.
Full-text indexing of collection pedigrees ("Ex...", "From the... Collection") and historical auction appearances helps researchers reconstruct provenance chains across decades of sales.
Our automated historical crawler continuously archives closed and upcoming catalogs from the leading numismatic auctioneers across Switzerland, Germany, the United Kingdom, the United States, Italy, Spain, France, and Austria.
Learn more about the NumisHammer historical indexing project and upcoming public search release.
NumisHammer is a specialized numismatic search engine and price realized archive. We aggregate and normalize historical coin auction catalogs from over 320 international auction houses so collectors, historians, and dealers can research coin types, compare hammer prices, and inspect high-resolution coin photography in one unified database.
Our full-text and structured parser supports direct queries by standard catalog citations including RIC (Roman Imperial Coinage), Crawford / RRC (Roman Republican Coinage), RPC (Roman Provincial Coinage), SNG & HGC (Greek Coinage), Sear / DOC (Byzantine), KM (Krause Standard Catalog of World Coins), Friedberg (Gold Coins of the World), Davenport, and Calicó.
We are currently completing the bulk historical ingestion of 15,000+ closed numismatic auctions and processing hundreds of thousands of 1800px high-resolution WebP coin plates. Once the historical baseline synchronization completes, full public query access and interactive price charts will open on this domain.