Where can I find a wedding band to match vintage engagement ring?

Here\\\’s a question that was asked about Vintage Diamonds:
My engagement ring is nearly 100 years old and I’m having a hard time finding a wedding band that matches.
It is a thin band that dovetails toward a solitaire 1/2ct round diamond. There is a small engraved pattern on each side of the diamond surrounded by mill grain.
Hope you can visualize it from my description.