Gujarat High Court Criminal Manual (subordinate court practice), 1977
When the evidence of an officer connected with the Mint, the Indian Security Press, the Currency Note Press or the Central Stamps Stores, Nasik Road, is required as to the genuineness or spuriousness of a coin, currency note etc., the Court should send such coin or currency note, etc. to the Mint Master or the other appropriate Head of the Department concerned by registered post under cover of its Court seal or by a messenger whose evidence can afterwards be taken. If it is considered necessary to take the evidence of such officer, he should ordinarily be examined on commission under the provisions of Section 503 of the Code of Criminal Procedure. This will prevent the great inconvenience of such officers being called away from their duties in Special Cases, the Court may summon such officer to give evidence before it.