vintage Casio PT-80 keyboard motherboards (from the 80s)

Description

Here I have a set of a Casio PT-80 analog keyboard motherboards (just the boards and nothing else).
They came out of a working unit quite sometime ago having in mind to clean the yellowish case. Unfortunately this never happened and the case was lost at a certain point (probably when moved from the house).
I do recall that unit was in full working order and I can assure you that none has ever tampered with its pcb or connecting cables but I can't verify anymore its working status as am lacking the expertise to test it outside its case. Please have this in mind if you consider getting it
I will post within EU (except Italy), US and Australia, by signed-for mail, to be on the safe side.
If you have any question feel free to ask and I will try to answer the best I can.
Thanks for taking the time to look into my listing