Cosmetically it's very nice, which tells me it's been treated well. It appears not to have been used much.
What it's worth, assuming you're thinking of selling it, depends a lot on where you are going to sell it and the audience that sees it.
Questions a buyer would have: Have you tested all the speeds? Do they seem accurate and smooth? Does the self timer work? Does the EV interlock work? Have you run film through it to test film advancement? Are the lenses clear? Has the meter been tested against another known-good meter? Is focusing and winding smooth? What is the condition of the groundglass (bright, dim)?
Just a wild guess here, but based on looks alone, it could be anywhere from US$750 to US$1200 if sold at a shop.