Lot 213 Micronesia SC#75/178, 1989-1993 Commemorative & Definitives Issues, 2 VFNH Souvenir Sheets, 8 Blocks and 13 Singles From Various Sets. 2017 Scott Cat. $38.50 USD, Click on Listing to See ALL Pictures

2 VFNH souvenir sheets, 6 blocks and 13 singles from various 1989-1993 Commemorative and Definitive issues, various sets which contain Prints of Paul Jacoulet(1902-1960), Pioneers of Flight, animals and plants of Micronesia. Includes 75a, 78a, 80a, 126a, 146-148, 155, 156/167 (fish definitives, missing 157, 159, 161, 162 and 163-166), 178, 134-137, 143 and 144.
2017 Scott Cat. for very fine mint NH is $38.50.
Starting in 1964 to 1967 some selected US issues are tagged with zinc orthosilicate , or calcium silicate in the case of airmail stamps. Both taggants can only be seen with short-wave UV light, which is dangerous to the eyes if viewed directly. Zinc orthosilicate glows yellow green, while calcium silicate glows red orange. All issues from the 1967 National Grange issue onward are normally tagged, and untagged stamps are generally errors, with the exception of the 1968 Airlift issue, and a few others. Gum was generally a shiny dextrine gum until the 1980's when an invisible DAVAC style gum was used for certain printings of the 1954-68 Liberty Issue coils and some values of the Americana issue, as well as Definitives from the 1980's and onward. Finally, all stamps to 1956 were printed using the wet method, but during the life of the Liberty issue, dry printing was introduced, and many values exist both wet and dry. Generally dry printings have much sharper and lighter printing, as well as stiffer and glossier paper.