My dad's biological dad and the dad of this match could be brothers. Me and the match have 507 cM across 16 segments, 7% shared DNA, Longest segment 100 cM. And Ancestry states she's my 1st cousin 1x removed (Dad's 1st cousin) or my half-grandaunt. However based on a centimorgans chart 500CM could be half-Aunt, Half Cousin, Half Cousin 1x removed, 1st Cousin 2x removed. So I guess Half-Aunt is still in the picture. Rather than an illegitimate child of Laurence Edgar Bellringer, but it still could be an option