Sicne I listed a set of Cadillac headlamps on ebay for what I thought was a 1930, there has been a question about the year. this set has the black medallion with a screw on nut to hold it in place. Apparently this would indicate that this was used on 341 and 353 cars according to the Parts Manual.
The lenses are Depress Beam with the following markings 11 3/32 X 10 7/32, Part No. 10259, designed for MAZDA LAMP # 1110. Is this sufficient information to make a defiinite identification?