The W123 200 and 230 gassers had the round E-code lights as well. The 230E got rectangular lights when the 230 faded. I don't know if the 200 continued with round lights through 85. I think the 250 had rectangular lights. The 280/Es had rectagular lights from day 1.

I like the round E-code lights myself which is what attracts me to the otherwise nondescript (to me) current crop of MBs. Not that the W140 is a styling milestone

Sixto
95 S420
87 300SDL
83 300SD