Penny (British pre-decimal coin)
20th century

Penny (British pre-decimal coin)

Section Title: 20th century
Table Section Text: None

Dates	Composition	Mass (grams)	Diameter (mm)

1707–1796	Sterling (92.5%) silver	0.5	12

1797	Copper	28.3	36

1798–1859	Copper	18.8	34

1860–1922	Bronze (95% Cu, 4% Sn, 1% Zn)	9.4	31

1925–1943, 1945–1954	Bronze (95.5% Cu, 3% Sn, 1.5% Zn)	9.4	31

1944, 1961–1970	Bronze (97% Cu, 0.5% Sn, 2.5% Zn)	9.4

Sentence(s)

The alloy for penny (British pre-decimal coin) was made with 97% copper, 0.5% tin, 2.5% zinc in 1944 and with 95.5% copper, 3% tin, 1.5% zinc in 1945.

final_sentence: The alloy for penny (British pre-decimal coin) was made with 97% copper, 0.5% tin, 2.5% zinc in 1944 and with 95.5% copper, 3% tin, 1.5% zinc in 1945.