Denarius, Marcus Aurelius or Commodus
Roman Empire · Circa 161-192 AD (based on similar examples of common reverses for these emperors)
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Russian Ruble (Imperial)

Gupta Empire Gold Dinar

German Empire 5 Mark

German Empire 20 Mark Gold (Wilhelm II)

Chinese Empire Silver Dollar (Hsuan Tung Dragon)

Korean 1 Yang Silver (Joseon/Great Han Empire)

Parthian Silver Drachm

Ottoman 20 Kurus

Postumus Antoninianus

Kushan Gold Dinar

German 3 Mark Silver

German 5 Mark Silver (Kaiserreich)
Denarius, Marcus Aurelius or Commodus
Roman Empire · Circa 161-192 AD (based on similar examples of common reverses for these emperors)
Roman Imperial Bronze Coin (possibly an Antoninianus or a Follis)
Roman Empire · Circa 3rd-4th Century AD (exact year unidentifiable from image)
Alexander the Great Gold Stater (Style)
Macedonian Empire (Ancient Greece) · c. 336-323 BC (Life) or 323-300 BC (Posthumous)
George VI British Penny
United Kingdom · 1946
One Shilling - George VI
United Kingdom · 1937-1946
Hadrian Silver Denarius
Roman Empire · 121-125 AD
Roman Imperial Antoninianus
Roman Empire · Circa 3rd century AD
Septimius Severus Denarius
Roman Empire · Circa 193-211 AD
Denarius
Roman Empire · Circa 82 BC
Follis (large module)
Byzantine Empire · Circa 498-668 AD (specifically, the image likely shows a follis from the reigns of Justinian I, Justin II, or Maurice Tiberius, given the clear 'M' design)
Dupondius of Nero
Roman Empire · Circa 62-68 AD
Late Roman Bronze Coin (House of Constantine)
Roman Empire · Circa 337-361 AD
Mughal Empire Copper Dam
Mughal Empire (Modern-day India/Pakistan/Afghanistan) · Circa 16th - 17th Century AD (Mughal Era)
King George V and Queen Mary Coronation Medal/Token
United Kingdom · 1911
Kushan Empire Tetradrachm of Kujula Kadphises
Kushan Empire (Modern-day Afghanistan/India/Pakistan) · Circa 30-80 AD
20 Corona
Austria · 1905
German Empire 10 Pfennig (Kriegsgeld)
German Empire (Deutsches Reich) · 1921
Victoria Bun Head Penny
United Kingdom · 1860-1894
Ancient Roman or Byzantine Seal/Amulet (likely not a coin)
Roman Empire or Byzantine Empire (approximation) · Unknown (likely Ancient to Medieval period)
George VI Florin/Two Shillings
Australia · 1938-1944
Caracalla Silver Denarius
Roman Empire (Rome Mint) · AD 210-213
100 Drachmes Alexander the Great
Greece · 1990-2000
Napoleon III 'Bare Head' 20 Francs Gold Coin
France · 1857
Ottoman Empire Gold Kurush (Jewelry/Commercial Bullion Style)
Ottoman Empire (Modern Turkey area and beyond) · Late 19th to early 20th Century design style (original series AH 1293 // 1876-1909)
Spain 5 Pesetas (Alfonso XIII, Baby Head Type)
Kingdom of Spain · 1898
Ottoman Empire 1 Para - Mahmud II
Ottoman Empire (Turkey) · AH 1223 // Year 26 (approx. 1833 AD)
10 Kopecks
Soviet Union (USSR) · 1976
Provisional Government of Greece 1 Lepton
Greece · 1828
Commodus Aureus
Roman Empire (Rome Mint) · c. 175-177 AD
Austria 4 Ducat Franz Joseph I
Austria (Austrian Empire) · 1915 (Common Restrike)
Morocco 5 Mazunas (AH 1320-1321)
Morocco (Cherifian Empire) · 1320-1321 AH (1902-1903 AD)
British India George VI One Rupee
India (British Empire) · 1938-1945 (Common range for this type)
Unknown Copper Coin with Eagle Motif
Unknown (possibly Eastern European or Middle Eastern) · Unknown (likely 18th or 19th century given wear and style)
Tetradrachm of Alexander the Great
Macedonian Kingdom (Ancient Greece) · Circa 336-323 BCE (posthumous issues continued after his death)
Could potentially be a Shilling, Sixpence, or similar denomination of British coinage.
United Kingdom (Great Britain) · Unable to determine the exact year from the provided image due to blurriness and distance. However, based on the design elements visible, it likely dates from the late 19th or early to mid-20th century. For example, the shield design with crown is present on various British coins across different reigns, including Victoria, Edward VII, George V, and George VI.
Maria Theresa Thaler (Restrike)
Austria (Austrian Empire) · 1780 (Frozen date; likely a modern restrike)
German Empire 5 Mark - Wilhelm II
German Empire (Kingdom of Prussia) · 1888-1913
100 Corona Gold Coin
Austria · 1915
Tetradrachm featuring Alexander the Great (Heracles/Jupiter-Ammon)
Ancient Greece (Macedonian Kingdom) · Circa 336-323 BCE (posthumous issues continued for some time)
Ottoman Empire 100 Kurush (Lira) - Abdul Hamid II
Ottoman Empire (Modern-day Turkey) · AH 1293 // RY 33 (Approx. 1908 AD)
French 20 Francs (Louis Napoléon Bonaparte)
France · Based on the visible effigy, this coin is likely from the reign of Louis Napoléon Bonaparte (later Napoleon III) as President or Emperor of France. Specific dates for 20 Francs coins of this type range from 1852 (as Prince-President) through 1870 (as Emperor). Without a clearer image of the date, a precise year cannot be determined, but it falls within this range.
Maravedí
Spain (or Spanish colonial territories) · Likely 16th-17th century (exact year difficult to determine from image due to wear)