Faber-Castell 2/83N Novo-Duplex

Oughtred Society slide rule condition rating: C0^*

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^*Condition ratings:
C0 = Mint condition with all extras such as box, case and instruction manual present also in mint condition, factory clean.
C1 = Mint condition with all extras such as box, case and instruction manual present but these extras not or not all in mint condition.
C2 = Mint condition but without one or more of the extras.
C3 = Very minimal signs of use.
C4 = Minimal signs of use.
C5 = Signs of normal use.
C6 = Signs of heavy use.
C7 = Small damage but for the rest C4 quality or better.
C8 = Damaged and well worn.