"Firma Otto Helbing
Münzhandlung in München von ca. 1889 bis 1910." - https://ikmk.smb.museum/ndp/koerperschaft/5584, 13.12.2021
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"Firma Otto Helbing
Münzhandlung in München von ca. 1889 bis 1910." - https://ikmk.smb.museum/ndp/koerperschaft/5584, 13.12.2021
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