Elkavox accordion with Elkavox 77 unit Black

Here is an accordion and it supposedly is the king of them all ...It comes with the connecting cable and we tried to hook it up but the fuse was blown ....so ...it may need work ....in overall better than average condition ...I was told it is from the 1970's and that looks about right !!! Comes with nice black leather shoulder strap ! I do not know if it works or not ....I would like to see it go to a player !