I like the pre-saftey, oil finish stocks best, although I am not up to speed on exact date variations. I do own a 39D, which is the pistol grip version of the Mountie. That is a sweet little gun, but i have a hankerin for the long barrel 39A because when shooting sub sonic ammo, the longer barrel is WAY quieter.
Were there "best" years of manufacture to look for? The late sixties guns seem to have the oil finish.