German Citizenship through Jus sanguinis- am I eligible?

My maternal great grand-father was born in Marienwerder and immigrated when he was very young (1 yr. His father (my maternal great-great grandfather) became a us citizen 7 years after their arrival. Would I be eligible for dual citizenship through my mother's line? I was born after 1975.

Hello "rbuonafede" :

I was interested in similar line of thought.
I cannot see any of your replies and threads here.
Did you have any worthwhile help ?
I'd be quite interested.

I'm in South Africa and with the same ideas ! ! ! ! !

Kind regards,
Stato