Values:
1998 Costa Rican 100 colones: XF or below-$0.19 (exchange value) UNC-$4.50
1959 Greek 10 drachmai (made of nickel, not copper-nickel): F-$0.30 VF- $0.50 XF-$2 UNC-$16 BU-$50 Proof-$2000
I posted the values for all conditions in case you will need them at some point or are just curious.