You can lift the playfield by 1st pulling on a latch release from underneath the PF
about 20inches inside the CAB.
The game pictured looks to be in very good condition (BG&PF) the CAB could be better but not bad certainly acceptable to most collectors.
$800-1000 seems about right.
2012 MrPinball price guide states $825
But be prepared to wait until the right buyer comes along.
All that being said, if you want a quick sale, i would price it at $600.
One of my favorite Parker Backglasses