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When the "Classics" line came out at the end 2006, it was pretty immediately popular with long-time fans, who had been largely starved for new toys of "Generation One" characters at that point. Although the line was fairly short-lived, intentionally making way for the line of toys created for the first live-action Transformers film in the summer of 2007, "Classics" gave fans about a half-year to focus on the characters they remembered and loved from their childhoods. It also gave Hasbro a chance to do a few repaint homages to offer to stores as exclusive sets. The "Battle for Autobot City" set, featuring Ultra Magnus and Skywarp, was exclusive to Target in the US. Both of the toys in this set are repaints, and in fact both molds have already been featured multiple times on this blog, so I'll just direct folks to the original uses of the molds,
Optimus Prime for Ultra Magnus and
Starscream for Skywarp, and simply direct readers to the search engine at the top of the page if interested in tracking down the others.