I couldn't find the pictures you linked to. You should do some research on the pressing. That could increase the value if it's a first pressing or some kind of special pressing.
If it's not a valuable pressing then the signatures will determine the value and signatures are not as valuable as many people think. Celebrities sign a lot of autographs these days so they are pretty common.
So I can't really help you out. I would suggest that you find a Pink Floyd discussion site somewhere like AudoCircle or Steve Hoffman and try to get some help there. You can always put it up for auction here or on eBay with a reserve of the minimum you would sell it for and see what happens.
If it's not a valuable pressing then the signatures will determine the value and signatures are not as valuable as many people think. Celebrities sign a lot of autographs these days so they are pretty common.
So I can't really help you out. I would suggest that you find a Pink Floyd discussion site somewhere like AudoCircle or Steve Hoffman and try to get some help there. You can always put it up for auction here or on eBay with a reserve of the minimum you would sell it for and see what happens.