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Shaun, likely the RS used hexavalent chromium in the conversion coating on the plating-- today for environmental reasons only trivalent is available and it looks different. So "tuning" the plating to match the original is the concours challenge. . .
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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