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Originally Posted by GTO.PAUL
The black seat adjuster knob was used in the later part of 1970. Still need to zero in on the "when". Pontiac 10 B -chrome, Baltimore 5 E- black. Check out my window crank article in the Legend. You will see the correct and later GM design. The window crank knob did NOT have a real chrome look to it (like many repo variations) and the outer covering did have an opaque slightly goldish tint to them which did turn more golden when exposed to the sun. Paul
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The originals were clear and had no tint to them. I read your article and looked at the window cranks you had pictured. Looked clear to me with the part numbers on the back. Slight goldish tint would look horrible against some of the interior colors Pontiac offered back then. Clear was more logical because it matched well with any interior color. The plastic in those knobs broke down with age and with being in the sun turning them a golden color. The replacements were made of a better plastic and didn't have that issue. That is it....