I'd still like to know how to tell the difference, assuming there is a difference. The Ebay Seller stated they are not BMW, but I find no way to tell that my originals are BMW either.
Here's some pics of an original blinker that came off my '71 Touring parts car, and a new one I bought some 5 years ago. The lettering both on the outside and inside is identical on both blinkers and there's no mention of BMW (no roundel no nothing).