Gujarat Stamp Act, 1958
If any instrument chargeable with duty and not duly stamped, not being an Instrument chargeable with a duty of twenty rupees or less is produced by any person of his own motion before the Collector within one year from the date of its execution or first execution, and such person brings to the notice of the Collector the fact that such instrument is not duly stamped and offers to pay the Collector the amount of the proper duty, or the amount required to make up the same, and the Collector is satisfied that the omission to duly stamp such instrument has been occasioned by accident, mistake or urgent necessity he may instead of proceeding under sections 33 and 39, receive such amount and proceed as next hereafter prescribed.