managed mail (MM) tray—A stackable cardboard or plastic container with an enclosing cardboard sleeve and plastic strap that is used to transport letter mail to or between post offices.
Mounted mint (MM) - the same as Mint hinged.
Mint no gum (MNG) - the stamp appears to be unused but has no gum. It might have been used but not cancelled, or have been issued without gum.
 See also: Condition, Cancel, Cancellation, Used, Type
  
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