On Transformers-Universe.com, the Original Series description comprises the following toylines from the early days of The Transformers:

The Transformers / Generation 1 (1984 through 1993)

Takara's various Generation 1 sublines:

• Transformers: The Headmasters (1987)
• Transformers: Super-God Masterforce (1988)
• Transformers: Victory (1989)
• Transformers: Zone (1990)
• Transformers. Battle Stars - Return of Convoy (1991)
• Generation 2 (1993 through 1995)

Finally, we also include the various reissue lines under this heading, such as:

Commemorative Series (2002 through 2004)
Encore Series (2008 through 2009)
and many others