I have to say, I do not know much about the history of these Albert centers, but these are one of the first 3 piece wheels, if you do some research on photos of the BMW race history. I believe they came on the market in 69, also possible 68. Difficult to say. The next 3piece wheels could be the Alpinas.....I do not find the papers at the moment, but I believe 69 and in 1972 came the BBS E30. Maybe BBS bought the production know how of Albert or maybe they did only a similar design, maybe the Albert production is Ronal as Alpina could be possible. Maybe someone did that research, it would be interesting.
Cheers W.