1 sen coin

The one sen coin (一銭) was a Japanese coin worth one-hundredth of a Japanese yen, as 100 sen equalled 1 yen.[1] These coins were minted from the late 19th century until the end of World War II. Like the other denominations of sen, these coins were eventually taken out of circulation at the end of 1953.[2]

One Sen
Japan
Value​ 1⁄100 Japanese Yen
Shapecircular
CompositionSeveral different metals
Years of minting1873–1945
Obverse
DesignVarious, depending on year.
Reverse
DesignVarious, depending on year.

Composition
Years Material
1873–1888[3]98% Copper, 2% Tin and Zinc
1898–1938[4]95% Copper, 4% Tin, 1% Aluminium
1938[5]90% Copper, 10% Zinc
1938–1943[6]100% Aluminium
1944–1945[7]50% Tin, 50% Zinc

Circulation figures

Meiji
One sen coin from 1873 (year 6)
Design 1 - (1873–1892)
One sen coin from 1898 (year 31)
Design 2 - (1898–1909)

The following are circulation figures for one sen coins that were minted between the 6th, and 42nd year of Meiji's reign. The dates all begin with the Japanese symbol 明治 (Meiji), followed by the year of his reign the coin was minted. Each coin is read clockwise from right to left, so in the example used below "一十二" would read as "year 21" or 1888. Some of the mintages included cover more than one variety of a given coin. Pattern coins from 1869 and 1870 (not listed here) are extremely rare.[8][9]

  • "Year" ← "Number representing year of reign" ← "Emperors name" (Ex: 年 ← 一十二 ← 治明)
Year of reign Japanese date Gregorian date Mintage
6th 六 1873 1,301,486[10]
7th 七 1874 25,564,953[10]
8th 八 1875 32,832,038[10]
9th 九 1876 38,048,906[10]
10th 十 1877 98,041,824[10]
13th 三十 1880 33,947,810[11]
14th 四十 1881[lower-alpha 1] 16,123,612[11]
15th 五十 1882 19,150,666[11]
16th 六十 1883 47,613,017[11]
17th 七十 1884 53,702,768[11]
18th 八十 1885 46,846,352[11]
19th 九十 1886 26,886,198[11]
20th 十二 1887 22,249,580[11]
21st 一十二 1888 25,864,939[11]
25th 五十二 1892 Unknown[11][lower-alpha 2]
31st 一十三 1898 (Reduced weight[lower-alpha 3]) 3,649,448[12]
32nd 二十三 1899 9,764,028[12]
33rd 三十三 1900 3,086,524[12]
34th 四十三 1901 5,555,155[12]
35th 五十三 1902 4,444,845[12]
39th 九十三 1906 Not circulated[12]
42nd 二十四 1909 Not circulated[12]

Taishō
One sen coin from year 5 (1916)

The following are circulation figures for one sen coins that were minted between the 2nd and 13th year of Taishō's reign. The dates all begin with the Japanese symbol 大正 (Taishō), followed by the year of his reign the coin was minted. Each coin is read clockwise from right to left, so in the example used below "二十" would read as "year 12" or 1923.

  • "Year" ← "Number representing year of reign" ← "Emperors name" (Ex: 年 ← 二十 ← 正大)
Year of reign Japanese date Gregorian date Mintage
2nd 二 1913 15,000,000[13]
3rd 三 1914 10,000,000[13]
4th 四 1915 13,000,000[13]
5th 五 1916 (Reduced size[lower-alpha 4]) 19,193,946[14]
6th 六 1917 27,183,078[14]
7th 七 1918 121,794,756[14]
8th 八 1919 209,959,359[14]
9th 九 1920 118,829,256[14]
10th 十 1921 252,440,000[14]
11th 一十 1922 253,210,000[14]
12th 二十 1923 155,500,000[14]
13th 三十 1924 106,250,000[14]

Shōwa
One sen coin from 1938 (year 13)
Design 1 - (1927–1938)[lower-alpha 5]
One sen coin from 1938 (year 13)
Design 2 - (1938–1940)
One sen coin from 1941 (year 16)
Design 3 - (1941–1943)
One sen coin from 1944 (year 19)
Design 4 - (1944–1945)

The following are circulation figures for one sen coins that were minted between the , and year of Emperor Shōwa's reign. The dates all begin with the Japanese symbol 昭和 (Shōwa), followed by the year of his reign the coin was minted. Each coin is read clockwise from right to left, so in the example used below "二十" would read as "year 12" or 1937. The size and weight of one sen coins were dropped significantly in 1938 with the Aluminium "Type 3" issue. Additional modifications of size and weight were also carried out in 1941 and 1944. Coin patterns that include examples struck on porcelain are not included here as they were never issued for circulation. It is unknown how many unofficial locally made clay baked coins circulated.

  • "Year" ← "Number representing year of reign" ← "Emperors name" (Ex: 年 ← 二十 ← 和昭)
Year of reign Japanese date Gregorian date Mintage
2nd 二 1927 26,500,000[15]
4th 四 1929 3,000,000[15]
5th 五 1930 5,000,000[15]
6th 六 1931 25,001,222[15]
7th 七 1932 35,066,715[15]
8th 八 1933 38,936,907[15]
9th 九 1934 100,004,950[15]
10th 十 1935 200,009,912[15]
11th 一十 1936 109,170,428[15]
12th 二十 1937 133,196,568[15]
13th 三十 1938 TY1 Cu[lower-alpha 6] 87,649,338[15]
1938 TY2 Br[lower-alpha 6] 113,600,000[16]
1938 TY3 Al[lower-alpha 6] 45,502,266[17]
14th 四十 1939 444,602,146[17]
15th 五十 1940 601,110,015[17]
16th 六十 1941 1,016,620,734[18]
17th 七十 1942 119,709,832[18]
18th 八十 1943 1,163,949,434[18]
18th 八十 1943 (Thinner) 627,160,000[19]
19th 九十 1944 1,629,580,000[20]
20th 十二 1945 Unknown[20]
gollark: Solution: ... hijack the builtin number class somehow?
gollark: Sadly, you can only do it to numbers below 256.
gollark: It's very ctypes.
gollark: ```python>>> memmove(id(7), id(8), sys.getsizeof(7))140001623574848>>> 78```
gollark: Oh, did you see my 7/8 rebinding thing?

See also
  • Penny, similar denominations in other currencies

Notes
  1. The mintage given on the right includes both "Large 4" and normal varieties
  2. It is likely that these coins did not circulate
  3. In addition to a design change, one sen coins were modified in 1898 by lowering their weight from 7.13 to 4.66 grams.[4]
  4. The size of the 1 sen coin was reduced in 1916 from 27.8mm to 23mm. The weight was also lowered from 4.66 grams to 3.75 grams.[14]
  5. Type 2 bronze coins will have more or less the same appearance as the Type 1 copper coins.
  6. All of the coins minted in 1938 are split into three different composition types (see table above).

References
  1. "Japan 1/2, 1, and 2 Sen 1873 to 1892". www.coinquest.com. Archived from the original on December 20, 2016. Retrieved December 8, 2016.
  2. "小額通貨の整理及び支払金の端数計算に関する法律" [A law of the abolition of currencies in a small denomination and rounding off a fraction, July 15, 1953 Law No.60]. www.shugiin.go.jp. Archived from the original on June 28, 2002. Retrieved December 5, 2016.
  3. "1銭銅貨 (1)" (in Japanese). www.buntetsu.net. Retrieved March 28, 2018.
  4. "1銭青銅貨 (2)" (in Japanese). www.buntetsu.net. Retrieved March 28, 2018.
  5. "1銭青銅貨 (3)" (in Japanese). www.buntetsu.net. Retrieved March 28, 2018.
  6. "1銭アルミニウム貨" (in Japanese). www.buntetsu.net. Retrieved March 28, 2018.
  7. "1銭錫貨" (in Japanese). www.buntetsu.net. Retrieved March 28, 2018.
  8. "Japan Sen KM# Pn6". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  9. "Japan Sen KM# Pn9". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  10. "Japan Sen Y# 17.1 Yr.6(1873)". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  11. "Japan Sen Y# 17.2 Yr.13(1880)". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  12. "Japan Sen Y# 20". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  13. "Japan Sen Y# 35". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  14. "Japan Sen Y# 42". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  15. "Japan Sen Y# 47". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  16. "Japan Sen Y# 55". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  17. "Japan Sen Y# 56". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  18. "Japan Sen Y# 59". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
  19. "Japan Sen Y# 59a". Numismatic Guaranty Corporation. Retrieved April 10, 2020.
  20. "Japan Sen Y# 62". Numismatic Guaranty Corporation. Retrieved August 3, 2018.
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