Carl was born in 1846.
"Pedigree Resource File," database, FamilySearch (https://familysearch.org/ark:/61903/2:2:3HSH-3MV : accessed 23 February 2020), entry for Carl (Carles) Gustav /Seltz/, cites sources; "Don Marks Family Tree" file (2:2:2:MMDV-XNK), submitted 15 October 2015 by Don Marks [identity withheld for privacy].
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