The Takumar lenses represent the best Pentax glass up to 1975, when the K-mount was introduced. It features an all-metal construction, including the focusing ring, and Pentax's signature SMC coating starting from the one shown in the picture "Super-Multi-Coated Takumar", which later productions of the same lens has its name shorted to just "SMC Takumar". Prior to that, the "Super Takumar" and "Takumar" officially does not make use of SMC although late productions of Super Takumars are said to be SMC coated.
With the introduction of the K-mount, the name "Takumar" has then been reserved for Pentax's cheaper line of non-SMC coated lenses, such as the Takumar-A 70-200/4, or even the relatively new autofocus Takumar-F 70-210/4-5.6 ED. Yes, it has got ED, but it hasn't got SMC, and it's marketed as a consumer lens.