Speaking of Super Radio's, Does anyone know the difference in the Series I, II, III and whatever other series that are or havce been produced . I've purchased 3 of them from Spag's in the last 1 - 1/1/2 years--They all work fine, but they just say "Superradio" on them,, No I, II, or III. Model # 7-2887B Thanks, Mark Casey map@map.com