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Looks like its held on with screws from the other side of pcb
Baby wipes for the buttons? Does Claire or Olga have any sensitive makeup removing pads?
Does the telecom logo bit come off to reveal a screw? Then metal polish!
Just noticed youdont have a # or * key, have you checked it dials out on your local exchange?
of course it dose honestly my brain, that means it wont work on all phone exchanges, old BT ones should be ok. you also wont be able to use automated systems unless you convert it to tone dial with a tone generator.
http://www.rotatone.co.uk/not tried them personally