Yes there are all gold Navis, but I have not seen an all gold rep as of yet, though I have the feeling that we may see them soon. Now you don't specify if this is a 3-6-9 or a 6-9-12 configuration, so its hard to zero in on what flaws to look for. I would look for the flaw that is common to all navi reps. Look at the numbers on the slide rule insert. If its gen, the numbers on the insert will come very close to the crystal. On the rep, the numbers are much further from the glass. Take a look at a couple of pics of bothe rep & gen, and you will soon be able to tell the difference quite easily.