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Thank you for your answer, but the German mark isn't in circulation anymore (for a long time actually). Germany adopted the euro in 2002. In my humble opinion, the strongest fiat currency in Europe to this day remains the Pound sterling. All the best!

Dear @vikthor !

I understand!

Thanks! All the best!

P.S.: The Swiss Franc is also quite powerful, while we are at it. I felt I needed to mention it as well. All the best once again!