Not much. I have one that I rescued from the trash, along with a PowerBook 165 and a 180c. Neat little machines.
There is a small market for them among vintage computer collectors/hobbyists - but in order to have much value you'd need to have all the original packaging, manuals and accesories it came with. If not, a working old PowerBook like that in good condition is really worth no more than $50 even to an Apple enthusiast, and even $50 is probably optimistic.