Yamaha Amp Nostalgia

I remember the Yamaha C4 and M4 with some nostalgia, as they were beyond my high school student budget, and quite beautiful with their back lit power and speaker selector switches.

20 years later, they seem to be reasonably well bid on the used market, although the lamp lights are often burned out and not easy to replace, apparently.

So last week, I impulsively bought an M2, because it looked even more powerful and more interesting than the M4, and the one I found seemed to be in good shape with working lights.

There is not much info on the web - does anyone know anything about this amp?

Thank you.