Advise on the crown position of Rolex

[AKKJ]

Should the position of the crown face upright when fully tighten?
My air king crown is at 4 o'clock position, is there any cause for concern eg like waterproofing issues?
Thanks.

[Oceanklassik]

http://www.sg-roc.com/threads/95534-...hlight=upright
http://www.sg-roc.com/threads/15826-...hlight=upright
http://www.sg-roc.com/threads/991-Up...hlight=upright