it's a 70-74 E body lower windshield trim. identified by the cut out areas for the surround trim ends. i think, probably wrong, E body cars only have this cutout.
71 and up B body cars lower trim is almost the exact copy. the only difference is they don't have the cutout on the ends. they use a wider surround end pieces.
if you swap end pieces the parts interchange. 70-74 E body and 71 and up B body use the same windshield.

the shape of the lower windshield wiper rests can narrow it down to more specific year.
i am not that into exact shape id. but 70 cars have a flatter wiper rest that the other years.

as far as value. i have a fully restored 70 lower windshield trim i can't get $100 for. shipping this part isn't cheap so i am stuck trying to sell local without much luck.