Welcome back for half dollar box hunt #13. In this hunt I'll be searching for silver, proofs, errors, foreigns, not intended for circulation (NIFC) low-mintage coins, and varieties such as doubled dies and no "FG' reverses.
I think you're onto one with that 23. And I think this makes it four different DDO's, including VDDO-001. I have two others pulled aside waiting to find a regular 23 to compare to. I went back to them to compare to yours and neither seem to be a match. Of course it's hard comparing on screens, haha.