Quote:
Originally Posted by TX '90 ZR1
My Z is '90 #442. I would call that pretty early. Built October "89.
I have 2 power keys. At least one I am pretty sure came with the car. The second is in an original GM box that I purchased. Both are "D" stamped which is the code for '90. Both also have black checkered on the left and red on the right with a light background. Don't know if I would call it really yellow, but a color that leans a bit towards silvery. Definitely not a black background. 
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The background on all keys is brushed aluminum. The 91-91 keys all have a red bowtie on black. The 90 keys have that, but also a gold bowtie with a black outline on red, as per the picture in post one.