Loc: Top of the 1959 Registry
cammb: Almost all of mine are crack and send; the 50%+ success rate is based on that. When I don't bust them out, it's because either (a) I don't have enough confidence they will cross, or (b) if I'm wrong and they wouldn't make the SGC equivalent grade, the residual value is higher in the other holder.
trex: Old pair of eyes is one guess. Not the exhuastive list though.