Hey folks, read the member's profile before replying. It's right there on the left, with a nice, helpful "location" identifier. There are billions of people who do not live in the US, so telling them to call or trade with a US firm could be a bit inconvenient for them.
ghazali7-
You can get a "blank" key from any Vespa dealer. Then take it to any locksmith, with your master key to be cut. Then follow the directions in the owner manual to program it.
If there isn't a Vespa dealer near you in Malaysia, then order the key on the internet. I doubt that the particular manufacturer of the key is critical, as long as it is stated to be for your model scooter.
If you can't find a source, then you could email Scooterwest in California, USA at
sales@scooterwest.com
Their web site is:
http://www.scooterwest.com/