I have heard that indented lettering drum tail lamps were Canadian. If so, why are there so many all the way down here in Southern California? My guess is that both types were made in the U.S. I am not aware of any of the reproduced drums with indented or engraved lettering.
Gary I checked the judging standards and the Canadian section F-33 describes how Canadian manufactured cars were. The U.S. section doesn't mention either style so may have made both and why so many in California. I agree that recessed ones aren't reproduced so Canadian Cars use raised letters for replacements.
Fullraceflathead
Mine has raised embossed letters on my ‘28 roadster pickup. Mine is supposed to be an authentic reproduction. I'm assuming that they made it accurate in every detail as it advertised. I believe I purchased it from Snyder's or Bratton’s about 15 years ago.
I have learned that "authentic reproduction" doesn't necessarily mean they are correct. "authentic reproduction" valve caps don't hold air as original Schraders caps. A benefit if a valve leaked.
Most people aren't interested in fine point judging and are restoring beautiful looking cars using available reproduction parts from our dedicated dealers.