Here are three color variations to the popular single groove LRI embossed: J.H. WESTON // CIN. O The embossing is on the lower skirt, centered with the through hole. The color in the photo is actually not deep enough. The LRI on the right is the darkest SCA Weston Single Groove that I own. Note the through hole (for the small gauge wire to hold the lightning rod to the LRI) is of one constant diameter, no flare out at the surface. I've owned these for a long while. Purchased over the past 25+ years.