(1) Where the consideration, or any part of the consideration, for a conveyance on sale consists of any stock or marketable security, the conveyance shall be charged with ad valorem duty in respect of the value of that stock or security on the date of execution of the conveyance.
(2) Where the consideration, or any part of the consideration, for a conveyance on sale of any property, consists of any security not being a marketable security, the conveyance shall be charged with ad valorem duty as a conveyance on sale of that property for a consideration equal to the value of that property on the date of execution of the conveyance.
(3) For the purposes of subsection (2) "property" includes any estate or interest in property.