The variety is a rather obvious one - not microscopic size difference.
The character in English "Yang" is different on the narrow and wide variety. The narrow variety shows it is "YANG" but on the wide variety, it is "Y A NG". What I am trying to point out the difference is the character "2" (二) which is written in Chinese character. I'm certain you can tell one is wider than the other.
Price wise - I really have no clue what is right these days. I suppose even in low grade condition, it maybe worth at least 80-100 dollars (depending what catalog you got) which I paid way over. But if you look at the current market, try offering twice as much - they just don't appear anywhere!
My partial coin collection
http://www.omnicoin.com/collection/gxseriesMy numismatics articles and collection:
http://www.gxseries.com/numis/numis_index.htmRegularly updated at least once a month.