On the wilson k factor tennis racquet's the logo are different

Question

http://www.regentville.com/2007/08/wilson-k-six-one-95-differences.html

if you scroll down and look at some pictures one racquet has the (tm) logo by the k factor

and the other has the (r) logo by it

can you tell me which logo is from the earlier batch wilson came out with?

Answer 1

probably the TM is from the earlier batch. later they revised as the K Factor already is a registered trade-mark.