I did see and admire the 2201.50 in your Avatar but didn't realise it was my old one lol!
I see what you mean about the slant on the lug slot, but I am fairly sure I have seen both kinds on genuine 930 end links. I've owned about 6 different watches with 1610 bracelets (I really love the SMP) and they do differ.
Out of interest, what are you using the 1610/930 on yourself?