I'll go with '29...
Didn't the '30 Olds have an oval "bubble" in the center of the headlight tie-bar with "Oldsmobile" in the center ?
_________________________
Frank McMullen
1941 De Soto, 1948 Chrysler NY,
1941,1954, 1955-first, 1989 Chevy trucks,
1960 Chrysler Windsor,
1964 Valiant Signet Convertible,
etc, etc...