Coin from China

Any help I could get in starting to figure out what this coin is.

 Possibly a silver 10 cents from Kwangtung (Guangdong) Province, Republic of China.
On the reverse there are seven symbols on the top, between the stars. They are running backwards, so reading anti-clockwise from the star on the right, the first four symbols I do not know. Then the last three symbols look like  10  8 Year  - so it is the 18th Year in the reign, making it 1929 I think.
  On Numista I now see that for that Province there are just four coins (Y# 417, 417a, 423, 426) which are 1 cent, 1 cent, 20 cents, 20 cents. So there are currently no 10 cents shown, so it is probably missing. I do see that one of the 20 cents shown does have a similar portrait to your coin also ...
https://en.numista.com/catalogue/pieces14086.html

 Having written all the above, I now think it is Y# 425 and the portrait is Sun Yat-sen though please check!

So in summary ...
Country: Republic of China
Province: Kwangtung (Guangdong)
Metal: Silver
Denomination: 10 cents
Date: 1929 (year 18)
Emperor: Sun Yat-sen
Catalogue: Y# 425

 Especially as I put in a Search  China Y#425  and this (see link below) appeared, which further down the page has two large photographs which match your coin. Hooray  

http://www.ebay.co.uk/itm/China-Kwangtung-Y-425-Yr18-1929-Silver-10-Cents-/260882530640?pt=AU_Coins2&hash=item3cbdcf8150