The internet is amazing. Here is the obituary for Edward Bringhurst Jr., born 1835, died April 3, 1912. He was a prominent lifelong resident of Wilmington, DE.
https://www.newspapers.com/clip/9248064/death-of-edward-bringhurst-jr/
He was descended from Elizabeth Shipley. His great-uncle Joseph Shipley, built the Rockwood mansion ( built 1851-1854), and passed to Edward in 1891. The mansion then passed to the daughter Mary listed on this "love token", and eventually passed to New Castle County. The Rockwood estate is now a museum and park:
https://en.wikipedia.org/wiki/Rockwood_Museum_and_Park
@realone, if you didn't know all this already, I can imagine that the museum would very much like to acquire this piece.