Kernrechtsfrage
Whether the insured could rely on trust protection based on the Chicago consulate letter to avoid contributory gaps from not joining voluntary AHV.
Extrahierter Entscheid
The letter did not amount to a legally relevant incorrect official assurance; the insured had not asked about voluntary AHV, and in any event any advice in 1987 would have been too late for the 1985-1990 period.
Extrahierte Begründung
An Auslandvertretung may give information, but only a misleading or evasive answer to a concrete inquiry can trigger trust protection. Here there was merely an unchecked enclosure field, no inquiry, and no factual basis to dispense with the requirement of self-initiated enrollment.