It is a WMS BB1 3 reel stepper slot. The price is very dependent on where you are located, but here in the united states, a fair price for that type of machine is between 500 to 700 USD. It is a 1st generation bluebird machine, so it is rarely sold anymore here as the 2nd and 3rd gen is what is still out in the open market here. You can install a TITO (Ticket In/Ticket Out) device in order for the machine to print and accept slot tickets and some have the option of putting a set amount of credits on the machine by pressing the service button (if you want this option, make sure you buy a TITO board with that option enabled). You will need a clear card for the machine to set it up for TITO.
That machine also appears to have coin in equipment installed (which is kind of rare in these parts). But I don't see a ticket printer, but even without a ticket printer, you can still install the TITO board with the free credit option. You would have to get a picture of the insides to verify coin operation.