suburban trim question

[FOREVER71]

so i was at a wrecking yard the other day and they had one burb a 71. and it had this brushed looking trim all the way around it just under the windows. looked in real good shape all the way around . ive never seen it before but then again i dont own one so i guess ive never really noticed. looked like a pain in the ass to get off. just wondering what models of burbs had it or if it was a dealer thing....let me know...thanks