CA Gov't Code Section 27335

In the recording of instruments of writing required or authorized by law to be recorded, the clerk, recorder, or other officer whose duty it is to make the record, shall, if the instruments have affixed to them any stamp purporting to be in accordance with any law of the United States, make a scroll in the margin of the record in the place of the stamp and enter upon the record within the scroll the amount in value of the stamp and the marks of cancellation.

A certified copy of the record so made is prima facie evidence of the original stamp, and that the stamp was affixed on the original instrument prior to filing the instrument for record in the manner and to the purport indicated on the record or certified copy.