The Standard Catalog identifies all three Camnitz cards in the T206 set as "Howie". My understanding is
that one of the 2 cards in the 460-only series (shown below) is that of Howie's younger brother "Harry".
Samuel Howard (Howie) Camnitz ...... 150/350 series card
Henry Richardson (Harry) Camnitz ...... 460-only series card
I'll post the 3rd Camnitz card (460-only series) later.
TED Z