Three gem set and diamond presentation tie pins, early 20th century

Each designed as the cipher of Tsar Ferdinand I of Bulgaria, one millegrain-set with calibré-cut emeralds and rose diamonds, the second set with circular-cut diamonds, rubies, emeralds and a sapphire, Austro-Hungarian assay mark; the third set with rose diamonds, circular-cut rubies, a cushion-shaped emerald and a circular-cut sapphire, Austrian import mark for gold, one small emerald deficient.