Proof of previous conviction of accused person

Where upon the trial of an indictment it is proposed to prove against the accused person the fact of a previous conviction– (a) a copy of the conviction for the crime punishable on summary conviction, or a certificate containing the substance and effect only, omitting the formal part, of the indictment and conviction for the crime, or as the case may be, purporting to be signed by the officer having the custody of the records of the court where the offender was convicted; or 75 (b) production of a copy of a warrant of commitment reciting the conviction purporting to be certified under the hand of the keeper of a prison, shall, upon proof of identity of the person, be sufficient evidence of the conviction.