China Kiang Soo ten cash identification help

Looking for some specifics on this ten cash. I can't seem to nail down the characters on the center obverse.
Thanks,
Mark

 

Log in or Sign up to hide this ad.

Maybe KIANGSU-KIANGSOO PROVINCE, Y# 162 as listed in "The Standard Catalog..."

Manchu “Boo-su” at center. Looks like there are many varieties.

Is the edge reeded?

 

Edge is plain.

 

Looks like copper. Plain edge, copper, maybe Y# 162.7 or Y#162.13.

 

Two and a half questions: why on earth are there so many variations on these coins? How does one determine value given the various types? Are some significantly more rare than a others?