Desireable machine, but seeing the photo you provided, I can see that there are many non-original modifications to this machine. The pop bumpers, lockdown bar, and card tray are all incorrect for this game. It looks like they were possibly taken from a much newer Gottlieb machine. It may be that this game was a partial game, and another machine was used to make it complete. Also, the playfield has a repainted section below the projection roto light inserts.
I can't see the cabinet in the photo, but I'd guess it too is not the original one. You'd have to go and give the machine a good looking over. If it has the functioning components of a "Pleasure Isle" machine, and all you need is a backglass and a cabinet repaint, the other things aren't tragic, and can be replaced with original style parts. Hard to say what it's worth based on that one photo, and from the incorrect parts I see. As I said, it is a desirable game, and a fun one too.