Was solls, sie hat eh das falsche Blatt, sonst waere sie laengst weg...

I have a 168000 in my small collection, the no. is R5xxxxx and its from 1987. the nine month period seems to be the most common theory, but it is Rolex, so nobody knows for sure!
I have seen pieces with 9mio no, since the production of 168000 was 1987 and th echange in the system occurred in the same year this makes sense...

The additional Zero engraved in the case is normally easy to spot, since it is quite different from the original factory job. Most of the times it is not even with the other numbers, deeper and the edges are not as smooth... take your time to look at it closely!

there are a few around these days, prices vary from 3200 to 3600 euros even without papers, but as usual demand creates the market and people are ready to part for certain prices...

good luck, and don't hesitate to post fotos

marc

P.S. why do you hide behind unknown?