Warwick China Date Codes

Warwick often dated their wares with the full year of manufacture and also used a simple date code as shown below, in which the month is indicated by the numbers 1 through 12 followed by two digits representing the year (i.e. 1-42+January, 1942). The numbers may or may not be separated by a dash.
Year/Month
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
January
1-20
1-21
1-22
1-23
1-24
1-25
1-26
1-27
1-28
1-29
February
2-20
2-21
2-22
2-23
2-24
2-25
2-26
2-27
2-28
2-29
March
3-20
3-21
3-22
3-23
3-24
3-25
3-26
3-27
3-28
3-29
April
4-20
4-21
4-22
4-23
4-24
4-25
4-26
4-27
4-28
4-29
May
5-20
5-21
5-22
5-23
5-24
5-25
5-26
5-27
5-28
5-29
June
6-20
6-21
6-22
6-23
6-24
6-25
6-26
6-27
6-28
6-29
July
7-20
7-21
7-22
7-23
7-24
7-25
7-26
7-27
7-28
7-29
August
8-20
8-21
8-22
8-23
8-24
8-25
8-26
8-27
8-28
8-29
September
9-20
9-21
9-22
9-23
9-24
9-25
9-26
9-27
9-28
9-29
October
10-20
10-21
10-22
10-23
10-24
10-25
10-26
10-27
10-28
10-29
November
11-20
11-21
11-22
11-23
11-24
11-25
11-26
11-27
11-28
11-29
December
12-20
12-21
12-22
12-23
12-24
12-25
12-26
12-27
12-28
12-29
Year/Month
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
January
1-30
1-31
1-32
1-33
1-34
1-35
1-36
1-37
1-38
1-39
February
2-30
2-31
2-32
2-33
2-34
2-35
2-36
2-37
2-38
2-39
March
3-30
3-31
3-32
3-33
3-34
3-35
3-36
3-37
3-38
3-39
April
4-30
4-31
4-32
4-33
4-34
4-35
4-36
4-37
4-38
4-39
May
5-30
5-31
5-32
5-33
5-34
5-35
5-36
5-37
5-38
5-39
June
6-30
6-31
6-32
6-33
6-34
6-35
6-36
6-37
6-38
6-39
July
7-30
7-31
7-32
7-33
7-34
7-35
7-36
7-37
7-38
7-39
August
8-30
8-31
8-32
8-33
8-34
8-35
8-36
8-37
8-38
8-39
September
9-30
9-31
9-32
9-33
9-34
9-35
9-36
9-37
9-38
9-39
October
10-30
10-31
10-32
10-33
10-34
10-35
10-36
10-37
10-38
10-39
November
11-30
11-31
11-32
11-33
11-34
11-35
11-36
11-37
11-38
11-39
December
12-30
12-31
12-32
12-33
12-34
12-35
12-36
12-37
12-38
12-39
Year/Month
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
January
1-40
1-41
1-42
1-43
1-44
1-45
1-46
1-47
1-48
1-49
February
2-40
2-41
2-42
2-43
2-44
2-45
2-46
2-47
2-48
2-49
March
3-40
3-41
3-42
3-43
3-44
3-45
3-46
3-47
3-48
3-49
April
4-40
4-41
4-42
4-43
4-44
4-45
4-46
4-47
4-48
4-49
May
5-40
5-41
5-42
5-43
5-44
5-45
5-46
5-47
5-48
5-49
June
6-40
6-41
6-42
6-43
6-44
6-45
6-46
6-47
6-48
6-49
July
7-40
7-41
7-42
7-43
7-44
7-45
7-46
7-47
7-48
7-49
August
8-40
8-41
8-42
8-43
8-44
8-45
8-46
8-47
8-48
8-49
September
9-40
9-41
9-42
9-43
9-44
9-45
9-46
9-47
9-48
9-49
October
10-40
10-41
10-42
10-43
10-44
10-45
10-46
10-47
10-48
10-49
November
11-40
11-41
11-42
11-43
11-44
11-45
11-46
11-47
11-48
11-49
December
12-40
12-41
12-42
12-43
12-44
12-45
12-46
12-47
12-48
12-49
Year/Month
1950
1951
January
1-50
1-51
February
2-50
2-51
March
3-50
3-51
April
4-50
4-51
May
5-50
5-51
June
6-50
6-51
July
7-50
7-51
August
8-50
8-51
September
9-50
9-51
October
10-50
10-51
November
11-50
11-51
December
12-50
12-51
Year/Month
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
January-December
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
Year/Month
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
January-December
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
Year/Month
1950
1951
January-December
1950
1951

Notes: Date code may or may not contain a (dash).