The 84mm Tinker (or Tinker Small) is the smaller version of the very popular Tinker model. The Tinker is closely related to the Spartan: the only difference is that the Tinker has a back mounted Phillips screwdriver instead of a corkscrew.
This particular Tinker is pretty old, given that the Phillips has a square shaft and a can key (a slot in the tip of the Phillips). No idea how old exactly (feel free to leave a reply if you can date this Tinker!).