The notice shall contain all the following:
(a) A description of the property assessed.
(b) The name of the person to whom it is assessed or a statement that it is assessed to unknown owners if such is the fact.
(c) The amount then due on the property.
(d) A notice that the property assessed will be sold on the date therein stated in front of the county courthouse to pay the amount then due on the property.
(Added by Stats. 1951, Ch. 391.)