The aero shift mounts in conjunction with the serial number do suggest a 1985 model of Asian origin. It may be Japanese or Taiwanease as this was just after the massive yen re-evaluation which had many Japanese manufacturers transferring entry level production to Taiwan. However, based on the weight and features, it appears to be at least mid-range and therefore is proabably Japanese. The one curious feature for this timeframe is that the gear cables still route over the bottom bracket shell, as opposed to underneath. That may be a clue.

I don't believe that I have come across a brand using that format and starting with an L, but based on what is in my database, it is not a Araya, Centurion, Miyata, Nishiki or Panasonic. Univega used suppliers other than Miyata, but during this period, the Miyata serial numbers seem to be the ones which pop up, so we can proabaly rule them out too.