The little clock-shaped stamps on the plastic is just a moulsing stamp, so they can see which mould a part came from. No use for identifying your goggles.
JT lenses basically come in two flavours: Elite and Spectra. The Elite lenses are in the cheaper models, and don't wrap as far around the eyes. The Spectra lenses extend out further to the sides, with left and right edges down to about an inch and a half high. I believe the Alpha model takes the Elite lenses, which unfortunately are slightly harder to get hold of. If your local supplier doesn't call them "Elite" by name, they may be sold as Xfire, Radar, nVader or even X-Ray lenses, because these other goggle systems all take the Elite lenses.
How's that?
