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Historically, the most glaring issue with all PAM reps that came with a date has always been the magnifier or the cyclops, sometimes coupled with an incorrect calendar wheel font and boldness. Ultimate reps that came out as early as 2008 have began to address this concern with a true to OEM crystal design where the cyclops is recess-milled and is made from the the same piece of corundum as the rest of the crystal along with better magnification and more correct datewheel fonts. Today, the new lines of reps from both leading makers have improved on the size of the cyclops, A/R coating, overall clarity, magnifying power, crispness, color and alignment of the datewheel print. Essentially, I can honestly say they've dialed in the the optics 85% to OEM. But the devil is in the details. The remaining 10-15% can be achieved by addressing one last issue. It's the same issue that existed in both makers reps for a long time, actually since the first ultimate OEM construction crystals were introduced. I can't say if the issue is still present in all models but it's definitely there on the flagship H-F PAM88I and Noob PAM29M v2 which is likely one of the most advanced of the recently released models. The problem lies in the finishing of the surface of the sidewall bore around the cyclops. The diamond cutter marks are polished out on the genuine OP crystal and thus are transparent. Yes, it's as simple as that. You will notice how the edges of the genuine crystal cyclops look like the edges of an underwater air bubble when viewed from the top or the face of the watch. Most reps I've seen new and old, as well as the above mentioned reps specifically, have the cutter bore marks left untouched so you can clearly see the white halo ring marking the edge of the cyclops that gets wider as you turn the watch and look at it at an angle. The bored out sidewall of the rep cyclops looks frosted, similarly to the side edge of the crystal so on a double-radius crystal like the Noob PAM29 and I would guess H-F 90I/222I that lacks the magnifier effect, the halo is rather pronounced, more so than on traditional lens shaped crystals. Reason is, the traditional lens crystal has magnification power that makes it appear thinner. When you look at watches with a lens shaped crystal at an angle -their rehauts look shallower for this reason. Hence the frosted bore of the cyclops also will look a bit shallower. Here's a couple of hasty photos so you don't fall asleep completely reading my opus. *CliffsNotes: New HF/Noob crystals with cyclopses still have a halo and don't look as great as OEM because the bore wall of the recessed cyclops is left with an unpolished frosted-looking finish similar to the edge of the crystal. OEM OP crystal w/ a 6mm cyclops, underside to show the polished bore: OEM OP crystal w/ a 6mm cyclops, topside: Noob PAM29M v2 crystal w/ a 6mm cyclops, underside to show the frosted bore: Noob PAM29M v2 crystal w/ a 6mm cyclops, topside to show the white halo: