I have a gen BCE and also a rep BCE, and the dial on the rep is not 1:1 if by "1:1" you mean perfectly duplicated. It's close, but not identical. On the gen dial, the ticks around the 15 minute marks (1 minute, 14 minutes, 16 minutes, 29 minutes, 31 minutes, 44 minutes, 46 minutes, 59 minutes) are shorter than the other ticks. On the rep, they are all the same length. This is easy to spot and an instant tell if you know to look for it. Also, the numbers on the subdials are too fat on the rep. In fact, all the print on the dial is finer on the gen than on the rep. The rep looks good by itself, but next to the gen it's quite obvious that the dial is better quality on the gen.
I know I'm being nit-picky, and it is indeed a very good rep, but the idea that you can't tell the difference is just not true.