32Museum educational resource
Michael Norris · The Metropolitan Museum of Art · 2000
“Origin and Technique,” printed p. 55 (PDF page 57): hand-engraved dies, a lower obverse die fixed in an anvil, a metal blank and an upper reverse die struck with a hammer.
Scope & limitations
The site uses an original schematic to explain this general method. It does not reproduce the publication’s artwork or reconstruct a particular Athenian workshop, tool set, strike count or coin specimen.
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36Reference guide
Numismatic Guaranty Company · Undated; accessed 2026
Explains adjectival ancient-coin grades, separate strike and surface scores, and the star designation for eye appeal. These categories describe different aspects of a coin.
Scope & limitations
Market research snapshot checked 17 September 2026. Small, selected samples do not establish an appraisal or a market-wide price index. Individual sale records and qualifications are retained in the pricing ledger.
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42Specimen certification record
NGC · 2018; record checked 2026
Records c.440–404 BC, Attica, Athens, AR tetradrachm; MS, strike 4/5, surface 4/5; grade date 12 October 2018.
Scope & limitations
The field titled Pedigree contains a design description, not former owners. The grade date is not a discovery date. Owner-supplied holder photographs corroborate the label; no new authentication is claimed.
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43Auction archive
GreatCollections · 2022
Records certificate 2086328-049 and 17.21 g. Auction ended 2 October 2022 and is marked sold.
Scope & limitations
Its title states strike 5/5, conflicting with the current NGC record, supplied holder photograph and 2024 listing. This inconsistency does not establish a regrade. Price requires login and is not reported here.
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44Auction archive
GreatCollections · 2024
Records certificate 2086328-049, 17.21 g, MS, strike 4/5 and surface 4/5. Auction ended 9 June 2024 and is marked sold.
Scope & limitations
The certification number links the record to the specimen. No buyer, later transfer, invoice settlement or continuous ownership chain is established. Price requires login.
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45Museum object record
Acropolis Museum · Undated catalogue
An owl dated 483–480 BC from a hoard found on the Acropolis in 1886. A documented example of a coin with a recorded hoard context.
Scope & limitations
This is an earlier, different specimen. Its findspot and preservation history cannot be transferred to NGC 2086328-049. No museum photograph is reproduced on the companion page.
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46Conservation guidance
Canadian Conservation Institute · 2007
Explains how metal and burial environments affect corrosion, including silver corrosion products.
Scope & limitations
General preservation context, not a diagnosis of this specimen or evidence that it was buried.
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47Ancient literary source
Suetonius; translated by J. C. Rolfe · Early second century CE; translation 1913
Describes Augustus giving old royal coins and foreign money as festive gifts. Supports interest in older or unusual coins in antiquity.
Scope & limitations
Does not establish an ancient collector’s involvement in this owl’s survival or an organized modern-style collecting tradition. Translation published in 1913.
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48Published hoard study
J. Grafton Milne · 1933
Journal of Egyptian Archaeology 19 (1933), pp. 119–121. Describes 54 Athenian-type tetradrachms as exceptionally preserved and apparently uncirculated.
Scope & limitations
The opening primary text was checked in an indexed scan; the complete page image could not be retrieved. Historical condition language is not a modern grade. The article considers an Egyptian origin for these pieces; they are not identified as the featured coin or its hoard.
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49Museum history of collecting
Smithsonian National Museum of American History · Undated exhibition
Places the recognizable collecting hobby in the Renaissance and notes possible ancient Roman precedents.
Scope & limitations
Ancient appreciation and the later organized hobby are distinct. The exhibit does not establish a unique first collector or this specimen’s ownership.
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50Historical letter in translation
Francesco Petrarch; translation edited by James Harvey Robinson and Henry Winchester Rolfe · Fourteenth-century letter; 1914 translation edition
Petrarch recounts giving treasured ancient Roman gold and silver coins to Charles IV as examples of rulers to emulate. See pp. 370–376, especially 371–372.
Scope & limitations
The page uses a broad fourteenth-century date to distinguish the 1354 encounter from the 1355 letter. These Roman coins are not the Athenian owl pictured here. No claim that Petrarch was the first collector.
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51Institutional collection history
Bibliothèque nationale de France · Undated institutional history
Describes Louis XIV expanding the royal Cabinet and moving it to Versailles so he could spend time with it daily; the collection is ancestral to the BnF department.
Scope & limitations
The Cabinet contained antiquities as well as coins. This institutional history supports the royal-collector setting, not any royal ownership of NGC 2086328-049.
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