What the marketing boys of the metal pusher say is not necessarily helpful or even true. Wikipedia is a better source. Also, legal tender is an utterly useless standard. By that benchmark, almost all pseudo coins are coins (which is why the metal floggers like it so much) and no coin issued before around 1800 is a coin. What matters is what is used as money, not what is legally permitted to be used as money but sold above face or struck in anachronistic metals or with gimmicks included and in many cases not even available in the area it is supposed to circulate.