Kernrechtsfrage
Whether the alleged contributor R.________ is identical to the deceased insured A.________ so that 1973-1982 AHV contributions must be credited.
Extrahierter Entscheid
The identity was not proven with the required full proof; the earlier contributions could not be taken into account.
Extrahierte Begründung
The documents submitted were insufficient, authentic original civil-status records were lacking, and the alleged identity was implausible in light of inconsistent personal data and missing contemporaneous documents.