Accuphase P-700 amplifier

I have a P-700 that I bought from a friend in Japan some time ago. Unfortunately, it gets very little use, so I think it's time to sale. Trouble is, I have no idea what to ask for it. It's in pretty darn good condition, but no box or manual.

Any ideas would be very helpful. Ultimately, I'm trying to buy new speakers "new to me" so that's why I'm selling.

Thanks in advance.