One way to tell the fakes if you are holding one (by which time it is possibly too late!), or hopefully if the right pics are provided, is that the links don't separate properly if you lower them to fold into the palm of your hand and then lift them up again. On a genuine BOR they should then hang down in a straight line, but on the fakes they stay somewhat bunched up. Evidently the clearance between the individual links isn't right. Also I don't think the end links are usually marked?
I have seen quite a few of these "aftermarket" (a weasel word for fake) BORs on genuine watches on ebay.
Click to expand...