Japan's Shōwa era lasted from 1926 to 1989. In 2009, Asahi Shimbun announced a polled list of 50 of the greatest 'masterpieces(名作)' of the Shōwa era. The only one not listed on MAL yet is 'Iga no Kagemaru' by Mitsuteru Yokoyama, which was ranked 27th.
https://www.comic-takaoka.jp/
Manga, 20 vol, 1968
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Author:10
1st
Manga, 45 vol, 1946
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Author:-
2nd
Manga, 6 vol, 1966
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Author:-
3rd
Manga, 19 vol, 1966
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Author:-
4th
Manga, 21 vol, 1951
Me:-
Author:10
5th
Manga, 3 vol, 1974
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6th
Manga, 21 vol, 1964
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Author:-
7th
Manga, 12 vol, 1954
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8th
Manga, 25 vol, 1973
Me:-
Author:10
9th
Manga, 26 vol, 1981
Me:-
Author:8
10th
Manga, 10 vol, 1972
Me:-
Author:8
11th
Manga, 16 vol, 1966
Me:-
Author:10
12th
Manga, ? vol, 1968
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Author:-
13th
Manga, 111 vol, 1983
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Author:-
14th
Manga, 18 vol, 1973
Me:-
Author:7
15th
Manga, 7 vol, 1982
Me:-
Author:9
16th
Manga, 34 vol, 1962
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Author:-
17th
Manga, 45 vol, 1969
Me:-
Author:10
18th
Manga, 14 vol, 1967
Me:-
Author:6
19th
Manga, 18 vol, 1977
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Author:-
20th
Manga, 6 vol, 1964
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Author:-
21st
Manga, 48 vol, 1972
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22nd
Manga, 34 vol, 1978
Me:-
Author:7
23rd
Manga, 49 vol, 1976
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24th
Manga, 13 vol, 1979
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Author:6
25th
Manga, 8 vol, 1975
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Author:-
26th
Manga, 15 vol, 1964
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Author:10
28th
Manga, 9 vol, 1975
Me:-
Author:7
29th
Manga, 24 vol, 1956
Me:-
Author:9
30th
Manga, 12 vol, 1968
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Author:-
31st(tied)
Manga, 15 vol, 1980
Me:-
Author:9
31st(tied)
Manga, 5 vol, 1962
Me:-
Author:8
33rd
Manga, 9 vol, 1975
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34th
Manga, ? vol, 1931
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Author:-
35th(tied)
Manga, 19 vol, 1965
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35th(tied)
Manga, 26 vol, 1972
Me:-
Author:8
37th(tied)
Manga, 17 vol, 1965
Me:-
Author:8
37th(tied)
Manga, 42 vol, 1984
Me:-
Author:7
37th(tied)
Manga, 4 vol, 1982
Me:-
Author:8
40th
Manga, 16 vol, 1972
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Author:-
41st(tied)
Manga, 17 vol, 1983
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Author:-
41st(tied)
Manga, ? vol, 1974
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Author:-
43rd
Manga, 67 vol, 1978
Me:-
Author:8
44th
Manga, 38 vol, 1967
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Author:-
45th
Manga, 18 vol, 1980
Me:-
Author:9
46th(tied)
Manga, 6 vol, 1989
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Author:-
46th(tied)
Manga, 200 vol, 1976
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Author:-
48th(tied)
Manga, 27 vol, 1983
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Author:7
48th(tied)
Manga, 10 vol, 1963
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Author:-
50th
