Edo Period 'Chogin' Silver Ingots
Coin/Bullion (Monetary Currency) · Tokugawa Shogunate (Ginza - Japanese Silver Mint). These were produced by the central silver minting organization in Japan, which held extreme significance under the Shogunal authority.
Pattern: Edo Period Monetary System (Keicho through Ansei eras). These are 'Chogin', or long silver bars, which were used as weighable currency.
Type
Coin/Bullion (Monetary Currency)
Maker
Tokugawa Shogunate (Ginza - Japanese Silver Mint). These were produced by the central silver minting organization in Japan, which held extreme significance under the Shogunal authority.
Material
Silver alloy (composition varies by era from approximately 50-80% silver, with copper being the primary base metal). The darker patina suggests a lower purity common in later debased issues.
Dimensions
Estimated length 50-70mm; weight typically ranges from 120-180 grams (approx. 30-50 Momme) for standard bars, though these appear to be smaller 'Mame-ita-gin' or fractional Chogin variants.
Description
A pair of authentic Japanese Edo-period Chogin silver ingots. These elongated, boat-shaped bars served as the primary means of high-value commerce in feudal Japan. Unlike Western coinage, their value was determined by their silver content and weight. The surface displays a deep, rich 'sulfide' patina ranging from dark grey to iridescent bronze, typical of silver buried or stored for centuries. The stamps identify them as official Shogunate-sanctioned currency.
Key Features
Unique elongated 'sea-slug' shape, official Ginza stamps (Jo-mon), and the presence of 'Daikoku-ten' imagery. The irregular, non-uniform cooling marks are diagnostic of genuine hand-poured antiques.
Material & Composition
Silver alloy (composition varies by era from approximately 50-80% silver, with copper being the primary base metal). The darker patina suggests a lower purity common in later debased issues.
Finish & Decoration
Crude, hand-poured surface with natural cooling pits and oxidation. The decoration is limited to incised or stamped marks known as 'Jo-mon' (official stamps). Style is utilitarian and representative of the Pre-Meiji Japanese aesthetic.
Hallmarks & Stamps
Incised characters at the bottom, including the 'Daikoku' (God of Wealth) stamp and characters for 'Jo' (certainty/authorized) or mint-official names. Each piece features multiple stamps to ensure authenticity and weighability.
Construction Details
Sand-cast or open-mold poured. The metal was poured into a flat mold and cooled, resulting in a slightly convex top and flat bottom with rough edges. They are entirely hand-crafted.
Functional Features
Weighable currency (Currency by Weight); these were not fixed-value coins but were weighed on scales for large transactions. They could be cut or chipped to reach specific market prices.
Handle & Grip Details
None. These are solid metal bars with no attachments.
Craftsmanship Details
Primitive but highly controlled casting. The stamps are the hallmark of craftsmanship here, needing to be applied while the metal was at a specific temperature to ensure deep, crisp characters without cracking the ingot.
Authentication Indicators
The depth and character of the hand-struck stamps are consistent with period tools. The 'porosity' of the metal surface matches authentic cooling patterns from the 19th-century Japanese minting process.
Origin & Manufacturing
Japan; likely the Ginza (Silver Mint) workshops in Edo (Tokyo), Kyoto, or Nagasaki, following strict government traditions.
Era & Period
Edo Period (1603-1868). These reflect the isolated Japanese economy before the Meiji Restoration, specifically the Tokugawa Shogunate's control over precious metals.
Age Estimate
Late Edo Period (c. 1800-1860). The shape and stamp style are consistent with the Ansei or Tenpo silver issues.
Cultural Significance
Chogin represent the transition from barter to a formalized mercantile economy in Japan. They facilitated the development of a sophisticated banking system and enabled the long-range trade of silk and rice.
Condition Notes
Very Good. The surfaces show heavy natural oxidation and tarnish, which is preferred by collectors of Japanese numismatics. There are no signs of modern filing or chemical cleaning. Structural integrity is solid.
Value Estimate
$400 - $1,200 per piece, depending on the specific weight and the clarity of the stamps. Rarer era stamps (like Keicho) command significantly higher premiums than later issues.
Care & Maintenance
Do not clean or polish. The value of Japanese 'Gin-za' silver lies in its original patina. Store in a dry, acid-free environment. Touch only with cotton gloves to prevent skin oils from causing new spotting.
Similar Pieces
Mame-ita-gin (bean-shaped silver) which are smaller, rounder versions of these bars; and Western 'Cob' coins, though the Japanese methodology of weighing bars is distinct from the Western 'piece of eight' system.
Interesting Facts
The 'Ginza' district in Tokyo, now known for luxury shopping, literally means 'Silver Mint,' as it was the original location where these bars were manufactured. These bars were often wrapped in paper packets of 500 grams for banking.