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TEXTBOOK 12 / Illustrated Catalogue: A View by Material

Coins and Banknotes by Material

Reading the Real Things — From Shells and Clay to Paper
Source photo
Artefact on the cover
Electrum trite, c. 610–560 BC, Lydia, Sardis, diameter 13 mm
CNG coins / CC BY-SA 3.0 (Wikimedia Commons)
The book of the course “Materials of Coins and Banknotes”
First Edition(2026)
BIG QUESTION

How should one examine a single artefact?

This volume in 3 minutes

  • All items from the catalogue of objects have been arranged by material. There are six perspectives for comparing gold, silver, copper, and paper: durability, portability, divisibility for small payments, fungibility, supply constraints, and acceptability. It is not a condition that all must be met for something to become money.
  • The illustrations use only photographs from the ledger, with collection and license information provided for every item. For items with no photograph of the reverse, or no recorded diameter and weight, it is noted as 'none', and no data has been fabricated.
  • At the beginning of each chapter is a section on 'How to Read This Material'. Look at the material, look at the shape, look at the mark, and confirm the year and origin. The order is the same for every chapter.
  • For each item, links are provided to its page in the artefact database and to the stop on the 'voyage' where it appears. This catalogue is the entrance; the place for reading is the stop.
  • At the end of the volume, you will find the chronological distribution for each material, a count of missing data, and an index for each section. All counts have been recalculated from the ledger and are current as of this book's publication date.
  • Catalogue: 436 items. Reverse photos: 277 items, diameter recorded: 80 items, weight recorded: 0 items, appears at stops: 321 items.

Table of Contents

  1. IntroHow to Read This Catalogue
  2. 1Before Materials, and the First Alloy — Shell, Clay, Electrum
  3. 2Gold — Incorruptible, Soft, and for High-Value Payments
  4. 3Silver — The Leading Metal for Most of History
  5. 4Billon — Copper with the Face of Silver
  6. 5Copper and Bronze — The Stars of Small Change, the Extremes of Weight
  7. 6Tin and Iron — Substitute Materials
  8. 7Nickel and Aluminium — The Twentieth Century's Choice for Functionality
  9. 8Paper — Even with Backing, the Speed of Exchange is Essential
  10. OutroWhere to Go from This Catalogue
  11. AppendixSUMMARY / TIMELINE / DATA / QUESTIONS / DRILL / SOURCES / INDEX / REVISION HISTORY
How to Read This Catalogue

When you pick up a single piece, where should you begin your examination? This illustrated catalogue starts with the material. When gold coins, silver coins, copper coins, and banknotes are placed side by side, the differences are immediately apparent. Gold does not rust; paper burns. Copper coins had little value individually, and large numbers were needed for significant payments. Like Course B02, this catalogue uses six perspectives for comparison: durability, portability, divisibility for small payments, fungibility, supply constraints, and acceptability. Here, these six are used as clues for comparison. It is not a condition that all must be met for something to become money. The suitability of a material is not determined by its quantity alone; the role of the same metal also changed depending on the region, era, use, and the person or organization issuing it.

Each chapter covers a single material. At the beginning of the chapter is a section on 'How to Read This Material', followed by the artefacts from the ledger arranged in chronological order. The entry for each item includes: name, section and place of issue, date, material and shape, diameter, collection and license, ledger entry, the stop where it appears, and a link to the artefact database. For items with no photograph of the reverse, no recorded diameter, or no recorded weight, this is noted. The promise of this catalogue is not to fabricate what is missing.

The reading order is the same for every chapter. Look at the material. Look at the shape (is it round, square, or a lump?). Look at the mark (is it a punch mark, an engraved die, or cast lettering?). Confirm the year and origin in the ledger. Then, go to the stop where that piece appears. The catalogue is the entrance; the place for reading is the voyage.

READING PATHRead before: No. 1, "Is It Really True? Checking History" (Full text free)Read next: No. 13, "Examining and Documenting Coins" (E9)
CHAPTER 1

Before Materials, and the First Alloy — Shell, Clay, Electrum

How to Read This Material

Before coinage, there were three things: shells that were counted, gifted, and stored; clay inscribed with debts and credits; and electrum, a naturally occurring alloy of gold and silver. Chinese historiography states that it is still debated whether the cowrie shells from Shang and Zhou dynasty tombs can be called money, as there is little evidence of them being exchanged for goods in markets. What remains on ancient Mesopotamian clay tablets are not records of barter, but ledgers of barley distribution and loans (E1).

With electrum, the ratio of gold to silver varied from one lump to another. Even if they looked the same, their value differed, and the receiver had to be suspicious each time. This uncertainty led to the invention of stamping a mark. When Croesus separated this alloy into gold and silver, the history of materials split into the next two chapters.

What is in the ledger
3 items (Overview: the world 1・United States 1・Japan 1). Date range from 610–560 BC to AD 1945 (never issued). 2 reverse photos, 2 diameter records.
What is not in the ledger
Reverse photograph: 1 item, diameter record: 1 item, all weight records. Missing data is noted as 'none' in the respective fields and has not been fabricated.
What to look for
  1. First, distinguish whether the material 'carries value' or 'carries a record'. Shell and clay have different answers.
  2. The colour of electrum. Compare the yellow of pure gold with the pale colour mixed with silver, alongside the artefacts in Chapters 2 and 3.
  3. Is there a mark? If so, is it decoration, or a declaration guaranteeing weight and fineness?
shell・clay・electrum — Number of items per century (total 3) 7th century BC117th century120th century1
Diagram Z-1: Chronological distribution of shell, clay, and electrum. Source: Counted by century from the map year in the physical ledger. This represents the distribution of artefacts in the ledger, not the historical mintage volume.
Source photo
Electrum trite Electrum trite
1 Electrum trite Overview: the world route / Lydia, Sardis / BC 610–560 / electrum・round / diameter 13 mm A coin of the Lydian royal house, struck with a lion's head on electrum, the same metal as the gold dust of the Pactolus river. Many scholars read its inscription WALWET as the name of King Alyattes (c. 610–560 BC). Analysis shows 54% gold and 44% silver. The scholar John Kroll holds that the royal house valued it as Lydian electrum as it occurs in nature (on average about 73% gold). The same type also comes from late 7th-century BC layers beneath the Temple of Artemis at Ephesus (Kroll 2010).
Unknown / Photography by CNG coins / CC BY-SA 3.0(Wikimedia Commons)
Appears at: Overview: the world ch. 2 “Lydia”・Overview: the world ch. 16 “Epilogue” → Object database
Source photoWampum (belt of shell beads)
no photograph of the reverse
2 Wampum (belt of shell beads) United States route / Native peoples of North America (New England) / 17th century (the age of trade money) / shell・lump / diameter not recorded White shell and purple shell ground into beads and woven with thread into a belt — wampum. For the native peoples of North America it was properly an object of ceremony, of record and of diplomacy. A belt for holding a covenant in memory and handing it on spread, in the fur trade with the colonists, into use as currency, and in Massachusetts it was made legal tender for small payments for a time in the middle of the 17th century. In colonies with no steady supply of coin, tobacco and grain and nails were used in payment too. What is money? The story of the dollar begins from that question.
Ian Alexander / CC BY-SA 4.0(Wikimedia Commons)
Appears at: United States ch. 1 “A colony without coin” → Object database
Source photo
One-sen ceramic coin One-sen ceramic coin
3 One-sen ceramic coin Japan route / Arita, Kyoto and Seto (contracted to private kilns) / AD 1945 (never issued) / clay・round / diameter 15 mm In the twentieth year of Shōwa, with the metal for coinage used up, a plan to fire coin from potter's clay was set moving. At the kilns of Arita, Kyoto and Seto the one-sen ceramic coin was formed to a diameter of 15 millimetres, and 700 million pieces were planned. Mass production was reached in July, but the fifteenth of August came before the number needed was ready. In law not a single piece was ever issued, and most were crushed.
Ihimutefu (specimen from the Japan Mint Museum, Saitama) / CC BY-SA 4.0 (Wikimedia Commons)
Appears at: Japan ch. 34 “From the lifting of the gold embargo to war” → Object database
From here on

This is the end of the free sample

What follows — Gold — Incorruptible, Soft, and for High-Value Payments, silver — The metal that played the leading role for most of history, Billon — Copper with a Silver Face, Copper and Bronze — Stars of Small Change, Extremes of Weight, Tin and Iron — Substitute Materials, Nickel and Aluminum — The Twentieth Century: Choosing by Function, Paper — Even with Backing, the Speed of Exchange is Essential — is for purchasers (the reference section too).

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Is It Really True? Checking History (free in full)

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