I have a 4' tall tank and for a fish only tank its great. Someone will have a use for it. Start at about $1000 and see what happens. You can always lower the price.
for $1000 that tank is going to sit for a while and with those dimensions it takes up a lot of space.
if you got it for free, throw it up for $540 ($1/1g) and let it go to the first highest offer.
As stated above most used glass tanks will go for about a dollar a gallon.
It looks like it was plumbed with the feed on one side and returns on the other and the four holes across the bottom were for closed loops.