29.5mm; 7.4gm 28.5mm; 7.1gm Too many oddities to list, from the obvious size and weight to several characters (probably dates/mints, etc) All comments welcome, including whether or not to Acetone-soak 'em. Thanks to all of you for looking and commenting on my posts.
Feel free to scroll to the middle part of my collection for Chinese coins: http://gxseries.com/numis/china/china_province.htm First one is from Kwangtung Province dated 1907. Second coin is from Szechuan Province dated 1906. I personally wouldn't recommand collecting all mint sets if you are a type set maniac as a couple of coins are a bit harder to find than the rest.
I'd try a distilled water soak first - maybe enough of the crud would come loose without losing the character of the coins.