There is imposed on each deed, instrument or writing by which any lands, tenements, or other realty sold within the city shall be granted, assigned, transferred or otherwise conveyed to, or vested in, the purchaser or purchasers, or any other person or persons, by his or their direction, when the consideration or value of the interest or property conveyed, exclusive of the value of any lien or encumbrance remaining thereon at the time of sale exceeds one hundred dollars, a tax at the rate of twenty-seven and one-half cents for each five hundred dollars or fractional part thereof. (Prior code §8-49)