READ THE RULES!!!!
CAO 20.18 Appendix III (d).
Where in this C.A.S.A reference does it state an accurate timepiece may be ommited if worn on the wrist.
I am being specific this time. I refer to IFR passenger charter.
Where Where Where????
To answer your question...THE CAO's is where I get my info.
Read it! Read it! Read it again! And read it properly this time.