The following has been brought to my attention, but it is rare, as most Jews
In some areas the Jewish records, in the Civil Transcripts of Roman Catholic
records, can be identified by the 'mark' made by the witnesses or principals.
Since the Jews would not make an X, if illiterate, they would often use an O
as their mark. This has been found in records >from Plock and in rare
instances in Krakow.