In the stamp collecting hobby ...
similar markings on postage stamps (called watermarks) are assigned different catalog numbers. For the postage stamp collector/specialist, a watermark detector is virtually mandatory. Personally speaking, I don't chase the UV markings on chips, but I do understand the fascination that some chippers hold for these chips with UV marks. A catalog listing of all the different UV markings on casino chips would make such a reference more costly and much more larger in size.