While the Old Church Slavonic inscription on the upper border of this icon clearly reads, The Holy Prophet Habbakuk, it would seem the iconographer of the offered lot has incorrectly ascribed (painted) the wrong symbol for the prophet Avvakum/Habbakuk, rather instead he has painted the symbol for the prophet Zachariah, called the “Sickle-Seer” based on the Septuagint version of Zachariah 5:1-3. "1 And I turned, and lifted up mine eyes, and looked and behold a flying sickle. 2 And he said to me, What seest thou? And I said, I see a flying sickle, of the length of twenty cubits, and of the breadth of ten cubits. 3 And he said to me, This is the curse that goes forth over the face of the whole earth: for every thief shall be punished with death on this side, and every false swearer shall be punished on that side."
Considering the fact that many iconographers were themselves illiterate, these types of mistakes are not uncommon.