Your lucky that you have the original foot pedals and the fact it is cascade. Those two things alone have really increased its value. If they were black and no pedals would be worth $250 for the head and maybe $300 to $400 for each cabinet. If the one cabinet has the built in amp........price I would think would be worth about $300 more just because they are so rare to fine. Since they are cascade and depending on the naugahyde condition, a collector might be willing to pay double the price. Hard to say since I don't know market values for you area.
Pleat or one of the other members on here I'm sure will be able to give you probably a better idea the value of your equipment. Many of us on this site would kill to have those cabinets and pedals alone......the pedals you just can't find anymore. Think you will be shocked at what you'll find out they are actually worth I'm betting.