How to send a Rolex Dial to US from EU

[p-hunter]

If I make a deal with a TRF member on Sales for a Rolex Dial what is the easiest way for the buyer to deal with customs?

I will send the letter insured to the US. do they check wat is inside and the buyer have to pay tax and whatever you pay in US.
Or the letter will just pass tru the post terminal as nothing special is inside
I will declare the goods as a gift with US $ 100

Good advice would be nice to know before I put my Balck Arab Dial for sale.

(Yes I did change to the Panda Dial after all)

Thanks in advance