That's not like a nut that I've ever seen before. I recon your best punt is to try the OM - BMW - BMW? Are we talking pushbikes here?
Yes. But they arnt open / making bikes atm.
My guess - and it's only a guess - is that BMW aren't, and have never been, set up for manufacturing bicycles - someone else was (plausibly) making the bicycles for them. It might be worth pursuing that, if you are after spare parts.
@Thrasher started
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That's not like a nut that I've ever seen before.
I recon your best punt is to try the OM - BMW - BMW? Are we talking pushbikes here?