1985 CHP Unit #8395 Found!

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To my surprise, my cruddy digital camera was able to pick up the characters written at the top of the driver's side rear window -




The numbers 8395 are fairly clear. Notice how the characters with loops caused a pooling effect, like the letters were raised and water collected in those cupped areas.

I am 99.9% certain that my car is CHP #8395, and that would be consistant with CHP #8397 which has a similar build date and data tag info. So my question is, at what point was the CHP unit number written above the data tag on driver's door? Was this done when the cars were delivered, prior to the cars being painted and marked? Just curious why the CHP would write the numbers on the car like that. I'm thinking since there is no CHP number written on my door, that they wrote it on the window instead.