This revelation needed very careful checking, and the factors which convinced me this is the dummy mask and not a stand-by are detailed on the following pages.

Four potentially different Mr Sin masks will be identified by these terms:
"hero" (for the mask worn by Deep Roy),
"dummy" (for the mask worn by the prop dummy),
"stand-by" (for an unused third mask),
"2008" (for the mask I now own).

Although four masks are apparently at large in this tale, it should be clear by the end that there are actually only two!