I know quite a lot about Matsuoka guitars, and had/have many of them. I'm not quite sure what "L" stands for though, but something like "Limited" comes to mind. The 630 scale is a little unusual, but I can tell for sure this is a midrange model, without any fancy decorations and so on. Matsuoka guitars from the 80s are generally good, I had a M50 from -83, if I remember correctly, that was wonderful to play and had a very nice tone.
This particular guitar seems to be in "so so" condition, with an ugly repaired crack on top, but if that doesn't bother you, go for it. The neck has an ebony reinforcement strip, which is a good thing. I don't think it's all solid, but the "laminated" (also referred to as Double plate) guitars from this period are very good, and also doesn't crack so easy. The top is spruce and solid.
You can safely bid up to at least 300 dollars in my opinion, maybe even 400-500, if you want the guitar real bad. I wouldn't go higher than that, for this particular guitar.
All the best from Sweden
1950 - Jose Ramirez II
1977 - Kuniharu Nobe No.15
1990 - Antonio Raya Pardo 1A
2004 - Alain Raifort Grand Concert
2007 - Curt Claus Voigt Torres
Feel free to ask me anything about Japanese classical guitars.