Dwojak Coin: History of the Polish-Lithuanian 2 Grosze

Illustrated Specimen Details: Silver Dwojak (Półzłotek)

Example Specimen: Dwojak (dwugrosz koronny / półzłotek), 1766 — Polish-Lithuanian Commonwealth

Design & Minting: The obverse prominently displays the crowned coat of arms of the Polish-Lithuanian Commonwealth, encircled by a wreath. The shield features two eagles (symbolizing Poland) and two knights on horseback (the Pahonia, symbolizing Lithuania). In the center lies a smaller shield with a bull calf (Ciołek), representing the family coat of arms of the ruler. The surrounding Latin inscription reads STANISLAUS AUG. D. G. REX POL. M. D. L. (Stanisław August, by God's grace, King of Poland, Grand Duke of Lithuania).

The reverse explicitly states the denomination and silver standard across several lines: 2. GR. CLX. EX MARCA PURA. COL. This translates to 2 grosze, minted as the 160th part (the Latin numeral CLX equals 160) of a pure Cologne mark, a standard European weight unit for precious metals. Below this inscription is the mintmaster's mark FS, belonging to Friedrich Wilhelm Sylm of the Warsaw Mint. This specific 1766 issue saw a record mintage of 8,425,000 pieces.

1. POLISH-LITHUANIAN COMMONWEALTH (16th-18th centuries): dwojak = 2 silver or copper grosze

DWOJAK as a coin name.
The dwojak (also historically referred to as the dwugrosz or półzłotek) was a prominent Polish low-grade silver coin valued at two grosze, widely circulated during the era of the Polish-Lithuanian Commonwealth. The name directly stems from the Polish word dwa (two), literally meaning "the two-grosz coin".

Historically, the denomination originated in the 16th century. Early 2-grosz pieces were struck during the reigns of Sigismund I the Old and Sigismund II Augustus (such as the Lithuanian 2 grosze of 1565). However, in strict numismatic terminology, the term dwojak is most famously and consistently applied to the distinct silver coins issued between 1766 and 1786 under Stanisław August Poniatowski.

These 18th-century issues weighed just under 3.5 grams and were minted exclusively at the Warsaw Mint. Their production intensity varied drastically: while 1766 saw a massive emission of nearly 8.5 million copies, no dwojaks were produced in 1768, and other years saw mintages of only a few thousand.

A defining feature of the 1766-1786 series is the precise declaration of its silver content right on the coin: CLX EX MARCA PURA COL. This guaranteed that 160 such coins were struck from one pure Cologne mark (a historical standard mass equal to 233.856 grams).

Historical Background and Monetary System

During the 16th, 17th, and 18th centuries, the Polish-Lithuanian Commonwealth maintained a highly developed and complex monetary system. The dwojak served as a highly convenient fractional silver coin, bridging the gap between basic copper change and larger silver trade coins.

The Commonwealth Exchange Standard

In the traditional accounting system of the time, the dwojak operated smoothly alongside other familiar Polish denominations. The basic monetary structure was defined as:

• 1 dwojak = 2 grosze
• 15 dwojaks = 1 Polish zloty (since 1 złoty equaled 30 groszy)

Foreign trade records and neighboring numismatic sources often referred to the dwojak as a półzłotek, which literally translates to "half a zloty," reflecting its purchasing power within the broader European market. It circulated parallel to its fractional siblings, such as the półtorak (1.5 groszy), the trojak (3 grosze), the czworak (4 grosze), and the szóstak (6 groszy).

Numismatic Significance

The dwojak remains one of the classic silver denominations in Polish numismatics. Because these coins were struck over several centuries across different mints, surviving specimens often feature unique heraldic combinations representing both the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania. They are highly prized by collectors studying the gradual debasement of silver coinage and the complex monetary reforms of Stanisław August Poniatowski just prior to the partitions of Poland.

Key Point

The dwojak was a crucial two-grosz silver coin of the Polish-Lithuanian Commonwealth. While its origins trace back to the 16th century, its most iconic form was struck between 1766 and 1786. Named directly for its value, it provided an essential link in everyday commerce and remains a tangible artifact of Poland's sophisticated historical economy.