Sonographe sa250

How do you know which model or edition you might have?
Not sure of model #'s but when CJ first released the Sonographe line they had black faceplates with a red horizontal line running the length of the component (early to mid 90's). Later models I have seen had silver faceplates and black accents (mid to later 90's). I might still have brochures from the earlier line. Hth.