Bolivia, Scott 450, MNH.  1960, black 5,000b surcharge on 40b gray on gold, huge stamp (49mm X 53mm), top value to the Gates of the Sun definitive issue, fresh, bright, and F-VF.  2021 Scott catalog value: $18.00.

The stamp you will receive is not the one shown.  It is from the same block and similar in every respect. 

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