(1) Where an instrument:

(a) is given upon the occasion of the deposit of any marketable security by way of security for money advanced or to be advanced by way of loan, or for an existing or future debt; or 

(b) makes redeemable or qualifies a duty stamped transfer intended as a security, of any marketable security; it shall be chargeable with duty as if it were an agreement or memorandum of an agreement chargeable with duty under Article 5 of the Schedule.

(2) A release or discharge of any such instrument shall be chargeable with the like duty.