14. A machine which is—
(a)made in accordance with an approved pattern and which is or could be marked
, or
(b)first stamped before 1st November 1991 and marked “Class C” in accordance with the provisions for beam scales in the Weights and Measures Regulations (Northern Ireland) 1967, or
(c)of a type referred to as “common form” and which was first stamped before 1st August 1991,
is a Class III machine.