Question: what are the most collectible stamps?
Answer: Two Penny Blue. ... , Baden 9 Kreuzer Error. ... , 1918 Inverted Jenny. Value: $1.593 million. ... , The Whole Country is Red. Value: $2 million. ... , Mauritius Post Office Stamps. Value: $3.8 million for a pair. ... , 1859 Sicilian Error of Color. Value: $2.6 million. ... , Treskilling Yellow. Value: $2.3 million. ... , British Guiana 1 Cent Magenta. Value: $9.48 million.