I'm pretty sure the older JDM cars had a brown tint to the glass, whereas the EU cars were green. Not sure if there was a year when they all went to the same colour or not though.
Google didn't throw up much but there's an example of the brown tinted JDM glass here:
http://www.subaru-impreza-parts.co.u...en-bronze.html
Edit/
Another image if it helps you identify what you have:
http://www.ebay.co.uk/itm/2219890860...784&rmvSB=true