I have a similar model i bought in 2006 (power glide version). I believe Tama didn't have separate lines back then. I was just 'Iron Cobra' and you'd have 3 tastes: rolling glide (chain), power glide (chain with a power cam) and lever glide (nylon strap). Mine just says "Iron Cobra", no series or something like stated above. It is the 'pro model' though and not the cheaper variants that call themselves 'Iron Cobra' at the moment.