Information:
Around late winter of 2006 Banpresto made a limited edition Mr. Saturn from Mother 3. These specially made Mr. Saturn's could be won in crane games found in some Japanese arcades. Being a limited time only prize, these quickly flew out of arcades and found their way onto Japanese auction sites. This was later re-released for a limited time only around the summer of 2009. They stand about 15cm tall and each comes with a small red bandana. While wearing the red bandana he becomes Incognito Mr. Saturn!

This is actually the second Mr. Saturn plushie. The first came from Nintendo, vacuum sealed in a box along with an Art Book. By comparing the two plushies you can see that the Banpresto one is slightly larger, the material is nicer, and has a much bigger nose.

Images:


Thanks to Nightram for the Comparison picture.