I’ll get a few pictures of mine tomorrow... My car is located a few miles away. 30’s have a somewhat frosted lens, black shell and chrome/stainless trim ring. There’s a teardrop shaped mount to the cowl also. My Aug 1930 Master Parts Price List shows 2 different cowl lights for the 29 (I) and 30 (U). The picture shows a tubular (?) type mount for the 29 cowl light which is different from the 30 which has a more aerodynamic fairing around the bolt to the cowl.
Up until this point I would have thought '30 cowl lights were the same as '29, but it looks they mount quite differently. I have seen that style on a late '29 roadster but they may have been installed at a later date. They mount in a totally different manor than my conv land sedan which is early '29. Art
I cant say definitively these are original but from the lights themselves match parts book drawings and the mounts are what was on the car when I got it.