Recommendation for watch gold plater

[RichB]

Does anyone have a recommendation for a company to gold plate a watch case of mine? It's my grandad's old watch from the 1940s presented to him as a long service award from where he worked. Originally it was either gold filled or plate, not sure, but it has mostly worn through to the brass underneath. I've often toyed with the idea of having it plated to bring back the appearance but am loath to give it to just anyone. There must be specialists who deal with vintage watches? Anyone got any ideas?