hmmmm... until I see namebio showing this no way I am gonna get in.
I hear you on this.
I would feel squeamish chasing these in the aftermarket.
Mine are old, cheap BIN and hand reg.
On the other hand, there are only 2,000 (N-NN and NN-N, the hyphen being a constant); depending on use, the hyphen actually makes sense: 25-1 or 1-25 both work.
1-10 or 10-1 would probably be the best of the best (not mine).
It could be something to watch, although I don't know how the Chinese market views hyphens.