I would pick 6200 as the mother of all sport Rolex.
Being possibly the 1st Sub release by Rolex and in term of rarity the ratio is 4 Milsub to 1 6200.
If we dig we can find some Milsub laying around but the same can't be said about the 6200. Been collecting for 8 years and only so far seen two 6200 but a dozen Milsub.
It would be my grail but I also need my house to stay so I'm not sure I can pull the trigger if I see one.
Regards
Tyler
Getting a COMEX or a double Red or a mil sub would be a dream come to true to many a Rolex collector.
Mil Sub will be the mother of all Rolex grail.......