Mekong Mike, I don't mean to burst your bubble, but those cache coins, even up to 1000 yrs. old, arrived here in much later times. Like in the regular westward exploration, and mine and RR worker times (1800s or whatever). Yes, even when the coins were hundreds, or even perhaps 1000 yrs. old. Because you see, those cache coins circulated without any regard to their ages, and thus show up at RR worker and gold rush era sites, WAY older than the sites they were found from. Apparently in China and Japan, those coins were made en-masse, and stored in barrels or whatever. And brought out at random times, with no regard to their mintage times. So the coolies and emigrants from those regions brought them over in normal historic periods that you are accustomed to.
I've found scores of those cache coins where I'm at in CA, since we have historic "China town" districts where emigrants settled after arriving here for the fishing industry, RR workers, mine workers, etc.... And yes, they can date to many hundreds of years before the Europeans were even in my area. But those dates have no relevance whatsoever to when they were "dropped".
I had to chuckle once, when I read about how a cache coin was found in some indian midden archaeological site somewhere in the NW (OR? WA?). And the archie dated the coin to the 1500s (?) or whatever. So the archies were "all over themselves with glee" thinking that this somehow proved the chinese were here before the earliest Spanish and European explorations in that region. I had to chuckle, because I knew those coins circulated and came here much later than their mintage dates
