CERTIFICATE OF ORIGIN : it is in few words what other brands call GUARANTEE, with production delivery date and owners name ( not always) and other details ( dealer ,etc .)
This certificate you CANNOT request after sale in Patek : only original owners can give it you or the dealer in the moment you buy the watch.
ESCTRACT FROM THE ARCHIVIES : you can have it asking Patek Geneve by fax and giving case and mov. numbers . ( not necessary to send the watch)
Both papers cannot give guarantee of autenticity to the watches but my suggest, especially for modern watch ( not vintage because is really difficult to have the Certificate) is always to ask the CERTIFICATE in order to be sure is not stolen. Yes watch world is not 100% safe
you know . Normally when tehy stole you the watch on the road you dont have the Certificate togheter with you
CERTIFICATE OF ORIGIN : has value between collectors ( IT'S LOGIC , it means safe seller ) I dont know if money value but for a collector like me YES
I hope you enough info .
Regards to all of you
W