Its so hard to get to a price on these unique items. Obviously being Rolex signed twice helps. If it was 18K or platinum had precious stones, pearls or even intricate Guilloche I would say the price would go up.. to way up in a hurry. If it it had a matching fancy pin it would also make the price go up. Who knows if there ever was one. Until someone disagrees I would say $400 in a retail setting might be realistic. Doubtful it would fly off the shelf at that price though.
Again this is just one opinion. -You know how that goes