The text on the back supposed to be referring to the Durarara!! (デュラララ!!) series.
However, the title logo was crafted poorly; it's missing the dakuten on デ, looking more like テ, and the second ラ seems squished, looking more like フ. Also, browsing for "medal", "pendant", and "keyholder" didn't return any results that look like ...
You could count Tetsujin 28-go, or Gigantor as it was known in the west.
This one was erected in Wakamatsu Park, Kobe, after the Great Hanshin Earthquake of 1995. The idea was to rejuvenate the area with tourism.
As far as I know, this is full-scale, at 18m (59ft) tall.