I pick that up that DW case set on Repgeek ... few months ago
I did pick up a Phong 1655 midcase many years age, his bezel was not equivalent to Genuine, so I found a Gen 1655 bezel with a ding... most the other Gen parts for the case I collected over the years, including 1570 GMT movement (posted over at the new HF)
I always remember Phong use to justify his expensive parts, and cases on using better stainless and specs compared to Yuki ... he would say "yuki ws garbage" .. LoL
I'm waiting for Ruby to reply ... because I want to see what they have for a complete 1680 bezel. Otherwise a GEN 1680 bezel assembly with insert runs about $1000 ... then I have to send it to Necky for case machine and placement
As far as what I see ... all the new and "close to spec" vintage Rolex case sets are coming from Vietnam ...
I have GEN White 1680 dial MK5 ... just need to get a hand set