(1) A person who is convicted of being a common forger is liable on conviction on indictment to imprisonment for life.
(2) A person is a common forger if—
(a) he or she is proved to have used, or to have aided and abetted the use of a device specially contrived or adapted for the purposes of forgery;
(b) he or she is convicted on indictment of forgery, having been previously convicted on indictment for counterfeiting, falsification or forgery;
(c) he or she is proved to have had in his or her possession, custody, or control, at the same time or at different times, 2 or more documents which he or she knew to have been forged, and by which he or she intended to commit any such indictable offence.