Reassembling a Tian Harlan Chromachron Watch

[potatan]

Hi,

I had a few difficulties separating the dial from the movement of this watch, but after a bit of gentle prising it popped apart.

See here 

However, as it came apart two pieces dropped off and I'm not sure what order and orientation to reassemble them.  The two pieces look like a tricorn which is concave / convex depending on which way you look at it, and a flanged piece without teeth.  

I am able to reattach the movement to the dial feet now, but I wonder if these parts should be fitted before the dial, and in which order - or similarly whether they should go on after the dial - and again, in which order.

Pics attached of the dial with movement in place, and the two unidentified pieces.

Thanks for all advice