This is a vintage, 1977 Mattel Hot Wheels Highway Patrol car, #12, diecast 1:26 toy car. The bottom of the Mid Century toy is marked with the Brand, year 1977 and "Hong Kong". The vintage micro car is white with black side panels reading "Highway Patrol - Protect-Serve". (The word Highway is worn off on one side.) I have seen editions of this Hot Wheel car described on line as dating to 1978 but the year is clearly marked 1977 on the bottom. It is in good condition for a vintage toy with some wear to the paint and parts appearing to be in place. It measures about 3" x 1".
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