Apart from the mint, at 9 o'clock, the other difference with the Fujian variant is the character on top (Dāng). You have translated this as "valid". I beg to differ. Run it past Google translate and you will find that it means something like "to be equal". In other words, this coin matches, should be taken for 10 cash.
In my previous comment, I tried to outline the confusion between token money and underweight money at the place and time of issue. Dāng implies: this is not 10 cash in metal, but it serves as such. That's the token interpretation. I think "valid" is too close to the underweight interpretation and too far from the original meaning.
Peter
