due to the necessary cost of obtaining certificates. These six stamps are from the Italian Occupation - pairs overprinted for the islands of Cephalonia and Ithaca. I've listed them below, along with quantities issued and Scott '14 values for unused:
- 1941 30d Orange Brown (N17; 364 issued; $1,400.- )
- 1941 25d Rose (NC3; 319; $650.- )
- 1941 50d Violet - the key stamp (NC5; 115; $4,500.- )
- 1941 100d Brown (NC6; 245; $2,250.- )
- 1941 50L Violet Brown (NC11; Unknown; $ 2,400.-)
- 1941 50L Gray Green on pale green (NRA5; Unknown; $875.-)
These stamps have remained grossly undervalued because of the inconvenience and cost of getting them expertized, but they have multiple market appeal in Italy, Greece, and possibly Germany (due to the later occupation).
Those interested in viewing a list of scarce stamps with printing quantities of 100,000 or fewer may wish to check out the StampSelector Scarce Stamp Quantities Issued List, which currently contains over 9,700 entries. Researching quantities issued data is vital to determining in which stamps to invest.