Originally Posted by T-Mar

I don't know the identity but the serial number may indicate 1989 manufacture. The presence of a kickstand plate is typically an indicator of a entry level model and this one is crooked. Installing a kickstand could interfere with the rear derailleur cable. If you remove the fork, there may be the fork manufacturer's name, a date code and an alloy designation. Another good indicator of frame level is the diameter of seat post required.