That may be true, but I have been tracking UV differences for many years now and there seems to be a pattern to them. Older UV markings tend to be very small, while newer ones are larger and so on. As far as the new SCV/LCV variations that have been showing up recently on new Paulson chips, that's a new incidence and I have not seen them in older chips. The earliest I remember that is from a Fort McDowell 25¢ chip. What I refer to is that when you see a different UV marking on an older chip, it corresponds to a reorder of that chip and typically that chip will have something different about the face of the chip also, i.e. colors, font sizes, etc. I can look at the TCR listings for some chips and see the progression of the UV markings on the newer ordered chips. I have looked at many UNC chips purchased at the same time and have not found significant differences between UV markings like I would find in chips ordered a few years apart. Classic example might be the Barbary Coast "Live the Legend" $1 chip that has several years encoded in the UV markings to correspond to the years they were issued. If I had one of those and it was "03" under UV, I can safely assume it was issued in 2003 and not 2006. I have had many UNC Mandalay Bay chips run through my hands while playing poker there for the past 5 years and each time I go there and see newer $1's I take a few home and check the UV to see if they are different. Many times they are and they have slight differences on the faces also. But the TCR will list only one chip of that type. I think it's wrong to attribute only one chip to a casino that has been open for many years and has obviously done reorders of chips. It's only my opinion but I'm not the only one who collects UV different chips and to list them according to TCR #'s becomes difficult when I have 5 or more of the same TCR #, but different UV. Like I said earlier, TCR didn't differentiate for a long time between SCV and LCV chips, but now do in many cases. Will there be a time when they begin to acknowledge UV differences also? And if so, by the time they do, it may be more difficult to know when they were issued than if they did it at an earlier time. It's harder to know about chips because unlike coins, chips don't have dates on them usually. I have a theory regarding the timelines of UV chips in relation to their issuances that seems to work for riverboats and probably others as well, but it's just a theory.