Personally? That would be really difficult. I feel like the 6239 would wear better (be more daily-able, if you will), but the DRSD may have more character (beautiful dial patina on that). Tough call. What's your gut leaning towards?
You need to do a lot more research if you are going to drop that kind of coin. Am I the only one who has never seen a black bezel on a 6239? I am also not sure about that dial. Certainly it is not from the year shown in the ad. And what is going on with the bottom pusher? Others who are more knowledgeable should chime in here.
Also, the bezel looks to have been touched up (photoshop or with paint) in the 80-85 area, and the sub-dial at 9 looks odd...too much going on with that one to think of buying.
Out of the 3 posted the DRSD is the one I would be most interested in.
Given your recent bad experience with the 5513, I will second the suggestion of heading to the vintage rolex forum. Also, there is a current thread on this forum that demonstrates that very expensive vintage watches are a risky proposition, even from established dealers. You have to do your homework.
Caveat emptor.
