From Tatiana’s TOMATObase:
Family heirloom from Germany. First introduced in the SSE 1993 Yearbook by Bill Minkey of Darien, Wisconsin (WI MI B). Bill Minkey received the seed from Nita Hofstrom of Clinton, Wisconsin, whose aunt, Ruby Arnold of Greeneville, TN, grew it for years. The seed originally came from Ruby Arnold's German immigrant grandfather, and Ruby simply called it 'German Green' tomato. Bill Minkey asked Ruby for permission to rename this variety and he called it 'Aunt Ruby's German Green' after Ruby Arnold.