The closest match to it that sold on Reverb recently was only a 60 watter, in a blonde tolex cabinet, and it sold for 2000 dollars.
I'd expect this to be worth more than that, being a 100 watter. And with the export/multivoltage transformer, and an EV. It's loaded!
So...it should bring something more than 2000 dollars if it's well maintained.
If you should choose to get it serviced before selling it, MAKE SURE that the service technician does not scam you out of those power tubes! That set of STR 415s will probably last forever and is worth several hundred dollars in good used condition. The odds of that amp needing new power tubes is close to zero.
The chassis needs to be taken out of the cabinet, the loose end of the tolex near the lower left corner of the front panel needs to be glued or stapled back down, and then the chassis needs to be put back in WITHOUT folding or rolling up the tolex. 5 minute job.