Cuba 1960 - Sc 637-40 C206-08 - (EDIFIL 814-20)
Stamps issued in 1960 to raise money for the Communications Worker's Retirement Fund. These are unused, NO GUM blocks of 4. The 2015 Scott catalogue value for four sets of singles is US $29.60 - The 2012 EDIFIL catalogue for 4 sets as singles is € 35,- or US $ 45.50. A lot harder to find in unused blocks of 4 than the catalogue price would indicate.