19th week of the 4th year of the decade. So realistically, it could be 1974, or 1984. The coding changed after 2000, and there was a triangle after the last three numbers during the decade of the 1990's.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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