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Premium Vintage Numismatic Library Set: Münzen und Medaillen A.G. Baselsale Catalogs XX (1959) & XXIII (1961) – Complete Archival Packet PairProvenance: Private Library of Collector Oscar Nettelhorst (New Haven, CT)Up for sale is an incredibly scarce, structurally complete pair of historic mid-century
numismatic sale catalogs from the world-renowned Swiss firm **Münzen und Medaillen
A.G. Basel**. Both volumes focus deeply on historic European Coins of the Middle
Ages and Modern Times (*Europäische Münzen des Mittelalters und der Neuzeit*).This specific set is exceptionally rare because **both volumes retain their original,
matching official ephemera inserts. In the world of coin collecting, standalone
catalogs are quite common, but packages complete with their original pre-sale
estimation lists, mail offer sheets, and official results lists are highly sought
after by numismatic bibliophiles and researchers tracing coin lineage.### ITEM 1: AUKTION XX (Vente Publique XX)* **sale Dates:** December 15–16, 1959 (Basel, Switzerland)* **Cover Art Features:** Silver Basel City-View Thaler (*Basler Stadtansicht*) over
the Rhine River.* **Key Special Collections Cataloged:** Central Europe (1150–1650), Switzerland/Basel
series, Sweden, specialized premium Russian series (including early coinage and
pieces from Peter the Great), and large-format historic Gold Coins.* **Included Ephemera Documents:** 1. Original printed Final Prices Realized booklet (*Liste der Schätzungen und
Ergebnisse*). 2. Original Münzen und Medaillen A.G. billing/invoice sheet. 3. Original official Swiss Airmail Mailing Envelope (*Par Avion*).### ITEM 2: AUKTION XXIII (Vente Publique XXIII)* **sale Dates:** November 7–9, 1961 (Basel, Switzerland)* **Cover Art Features:** Silver Thaler of Frederick William (\"The Great Elector\")
of Brandenburg-Prussia.* **Key Special Collections Cataloged:** Named pedigree collections including
Bernese Silver (Sammlung F.B.), French Revolution & Empire (Sammlung R.K. in G.),
Brandenburg-Prussia from an anonymous princely collection, Austria, Bohemia,
Hungary, and rare German States (Brunswick and East Frisia).* **Included Ephemera Documents:** 1. Complete multi-page Pre-Sale Estimation Value Sheet (*Schätzungspreise /
Prix d\'estimation*) including historic 1961 exchange rate data (USD/DM). 2. Original, unused official Mail offerding Form (*Auftragsformular*).### PRESTIGIOUS PROVENANCE DETAILSBoth volumes originate from the private estate library of mid-century East Coast
numismatic collector **Oscar Nettelhorst of New Haven, Connecticut**.
* The catalogs feature his elegant, vintage purple ink cursive name stamp neatly
on the inside cardstock covers.* Includes his original vintage typed Connecticut paper address label. Because these marks are isolated strictly to the blank inside covers, they preserve
the pristine nature of the title pages and internal coin plates while cementing an
authentic collector history.### CONDITION REPORTVG vintage condition. Covers show minor, expected age-related shelf wear and
light paper toning. Internal pages and numismatic photo plates remain crisp, flat,
securely bound. See photos for more detail
