This type of hat saw use in the Bulgarian military for decades. The model first appeared in the 1930s and saw use up until the fall of Communism. The exact dating of these specific hats is not known, but is likely to range from the 1960s through the 1980s. A heavy wool cap that will keep winter at bay.
Distinguishing features include:
Pure wool Lined Button down ear flaps Bulgarian insignia This item weighs approx 200g
Although these will have larger size labels than you ordered, these do seem have to have shrunk somewhat, and so are being listed two centimeter smaller than the labels.