Your unit is probably an international version intended for South America and other regions of the world where FM was not yet popular (1950's and 60s).
I had a big Telefunken back in Venezuela that was just like this. It had incredible tone quality on the regular AM band.
The ferrite antenna can be a tough one. I am guessing a discarded "for parts" Telefunken of the era will have a suitable antenna. It doesn't have to be the "Opus". Concertino, Gavotte and other models probably use the same antenna.
Best of luck!
crooner
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Marantz 7, 8B & 10B
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