It is almost impossible to figure out the correct customs duties on watches coming into the US. Really. Don't believe me, look at this website:
https://dataweb.usitc.gov/scripts/tariff_current.asp
Easiest thing to do is to make sure the watch is sent declared through Canada Post, preferably using Express Mail Service (EMS) with insurance, that will connect with USPS Priority Mail when it clears customs. I have never had an item get hit with duties from USPS, even when value was fully declared. Not sure why, but the USPS is just lax about it.
If you use a carrier like FedEx or UPS, I'm pretty sure that they will present you with a bill for the duties (probably figured incorrectly in their favor with a hefty surcharge) and have a credit card swiper on hand to take payment.
I can guarantee that two identical watches sent to the US from Canada will come in with two different amounts of duty using common carriers.
gatorcpa
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