Bulgaria 1917 WWI 50c on Red Cross Sofia Regd cover to Geneva Switzerland (Image)

Bulgaria 1898 5cx5 on Regd cover from Varna to Verviers Belgium (Image)

Bulgaria 1913 9v w/ ovpt on Regd cover from Sofia to Graz Austria (Image)

Bulgaria 1929 9v w/ airmail ovpt on cover from Sofia w/ "Furth-Nurnberg/ Flughafen" cds at back to Germany (Image)

Bulgaria 1929 6lv on cover from Sofia to Cincinnati Ohio USA (Image)

Bulgaria 6v on airmail cover from Sofia to Basel Switzerland (Image)

Bulgaria 1898 1c pair+ 3c uprated on 5c postcard from Sofia to Verviers Belgium (Image)

Bulgaria 1902 Coat of Arms 10c UPU postcard from Philippopolis to Constantinople Ottoman Turkey (Image)

Bulgaria 1891 rare uprated regd postcard with reply to Dresden Germany (Image)

Bulgaria 1986 Swimming center inverted error variety MNH stamp w/ margin (Image)