Beats me! Everything about the car is Skylark except the windshield. The dash is Skylark and there is no evidence of the windshield frame being welded on, everything looks factory. If it was Olds or Caddy, it would have that dash. Frame number is Skylark. and is the same first four numbers as a Skylark that just sold last week in an auction here in Georgia. Wheels and spinners are Skylark, and the medallion on the steering wheel says Skylark. Another oddity is that the trunk has the individual letters that say Skylark, the same as the letters on a 54 Skylark. The previous owner says that it was the last of the run in October of 1953 and it may have been a factory mix that they had 54 windshields and no more 53 windshields. This would also explain the letters from 54 on the trunk, and there is no evidence that the 53 emblem on the trunk was removed and the letters installed. These things were built from 53 Roadmaster convertible and totally customized by factory craftmen and they have large amounts of lead to prove it! They started a new numbering system in 1954, but the documentation for Skylarks of 53 were practically non existent. There is no way to prove whether is was factory or no way to prove that is wasn't. I will restore it with the wraparound windshield because there is the good evidence that it was factory and I wouldn't want to change that.