* The birth/marriage/death happened recently (less than 6 months ago)
* The birth/marriage/death was recently late registered and/or the certificate was recently endorsed
* The birth/marriage/death happened in a foreign country
* The birth/marriage/death certificate was corrected or amended
* The birth/marriage/death certificate is “pre-war” (before 1945; if Manila, before 1951)
* The marriage underwent annulment