You have a lot going on with that coin. There's so many listings of DDO's and DDR's and WRPM's and it's easier to compare with the coin in hand. With it in hand, you can check each listing and see how many your coins matches up against. Wexler has 34 DDOs and 21 DDRs. Don't know how many are duplicated by http://varietyvista.com/ You have a lot of homework to do. Good luck! Keep us informed
You should also contact @paddyman98 and @Fred Weinberg. There's many others with more knowledge than I have re your coin but I don't recall the names.