today I got a Cherry G80-0530 in German layout, which was used with the Commodore PC-5 and PC-10. It is in almost pristine condition, apart from F10, which has dents on one edge.
There were no screws at all used to hold the keyboard together. There are just some tabs with hooks on the case, which can easily be bent back with your fingers to open the case. The PCB is held in place by two poles on the top case, which slot into the two holes in the top right and left corner of the PCB.
Here are some pictures, the lighting sometimes is a bit bad, it's a rainy day today:
Nuum