then watch prices will be lower in non-USA countries. US citizens might buy watches overseas and try to bring them home (declare or not declare, I don't know).
If watch companies try to harmonize pricing worldwide, then consumers in non-USA countries will pay a higher retail price than what it is now, while US consumers will also pay a higher retail price (but less than the full impact of the increased custom tariff). In other words, consumers in non-USA countries will bear part of the US tariff increase. Sigh!