Seiko mechanical movement calibre ranking

From low-end to high-end:

Manual-winding mechanical:

Super, Suwa Seikosha

Unique, Daini Seikosha

Marvel, Suwa Seikosha

Cronos, Daini Seikosha

Goldfeather, Daini Seikosha

5700/560, Suwa Seikosha

Lord Marvel, Suwa Seikosha

54, Daini Seikosha

44, Daini Seikosha

45, Daini Seikosha

Automatic mechanical:

66, Suwa Seikosha

76, Daini Seikosha

62, Suwa Seikosha

83, Suwa Seikosha

61/63, Suwa Seikosha

70, Daini Seikosha

614x/615x/618x

51, Daini Seikosha

44, Daini Seikosha

45, Daini Seikosha

56, Suwa Seikosha

52/4S, Daini Seikosha

4L?, Daini Seikosha

8L/9S/6S, Daini Seikosha