der Wertbrief
... die Sonner马克e 特殊的一种邮花 der Wertbrief 保价信 der Eilbrief 快信 ...
[邮] insured letter
... ingoing cash letter 现金收入凭证 insured letter 保价信 international call letters (无线电)国际呼号 ...
guaranteed delivery ; the insured letter
Held back valuable information
credit protection