Chris,
Those are Federal Director D1s. I only knew that they were made by Federal Signal when I wrote that, but thanks to a member here (FHP0827), the actual model name was identified.
FHP tested different plates for 3M (coatings, durability, etc), so there are multiple variations of the color/font/spacing.
__________________
Mike
'82 SSP (Marketing Order)
'83 Colorado State Patrol #202
'83 Texas DPS
'85 Florida Highway Patrol #1422
'93 Florida Highway Patrol #1187
'93 Florida Highway Patrol #1363
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