If the price is right, I'd jump on it. However, do a bit of research first so you'll know what the going rate is for this gear.

One very important point, though. You said it is "all original parts". This amp is around 50 years old. The power supply capacitors are virtually guaranteed to need replacement. The amp can end up damaged if they are not updated, and also possibly damage your speakers.

I'd recommend anything this old be checked by a tech who knows his way around tube gear.