I don't know too much about these so this might not be completely accurate. It seems to be one of the Proton Saga Limousine models converted by a company called ACE (Automotive Conversion Engineering). This appears to be a 4dr model, there was also a 6dr model called the Saga Executive, but the 4dr models may also have been called Executive. Proton promoted these cars themselves and they may have been available from Proton dealers.
JR