just looks like an old acrylic lightbox.
you could probably remove the sheet of acrylic, strip the vinyl off the face and re-apply printed vinyl. slide it back into the existing trim.
whilst out, replace the fluorescent tubes if thats what is illuminating it and clean and make good of the existing trim.
you will need it printed onto white back digital vinyl though, not grey backed as it wont allow the light to penetrate the face.
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