i have to agree with Walt on this one, i have seen a few sets of dublduck satinedge razors on here and ebay that have what your looking at here, its not plastic scales but celuloid, and by the looks of that blade the scales are decomposing quite badly, i would look at de-pinning that blade and seeing if its savable, if so restore the blade and look to re scale it with a different material altogether.
there maybe someone on here who can help you recover and re-use the inlays from the old scales, but i would really suggest getting that blade away from those scales as soon as you can.