These are so cool! It's amazing how affordable some of these are, even if they date back a thousand years or so!
There is one annual coin show I like to attend, and one vendor has these. I have to bring a binder with what I've already got, just to make sure I don't pick up duplicates.
Then, there's the matter of finding ones from other countries that made them like this. Japan, Korea, Vietnam...Unless you have references, it's easy to get confused.
Great photo, by the way!