I posted this in the sales rules thread, but realized this would be a better place to suggest it:
I'd like to suggest that sales posts include the seller's country/customs bloc at the beginning of the title (e.g. USA ZZF 114060 Submariner, EU XF Tudor Pelagos) as an amendment to the posting guidelines. This will greatly improve the ability to browse the forum for relevant threads with minimal effort on behalf of members posting.