I got this from a my friend's storeroom
It looks like some mechanical switch over rubber dome, but I cannot find a lot of info about this keyboard, which use AT connectors. I found out the brand name is "Legend" and that's about it. Can anyone help?
EDIT: I disassembled the keyboard and it seems it a plunger thing over a whole sheet of rubber dome with metal back plates. This is a helluva rubber dome keyboard with double shot keycaps(?), 1 plastic plate, 1 metal back plate.