dating fender amplifiers

Can anyone help me date Atleast fender amplifier.or gather more information on how it might be worth?
Ive got Fender amp knob red twin white snake skin design and am trying to find information about it, all I can find online is that his tall, heavy new.ii allready know your date between 87 and thinking 94.im sell but not sure how to price, works well and I think it has not messed anyone with.can help.PLEASE
Bring to a music store and have a book that has used equipment prices. They have a "trade" price and "price retail. The sale price is the price you sell it to someone. The trade in price is what will give for it to something else. Fender amplifiers are in possession of its value pretty well.
FenderĀ® Amplifiers presents the ’57 ChampĀ®: Stoned