Unfortunately that is a ttm secretarial version. Tony signed his name across while the secretary put one part on top the other. The secretary also seemed to almost always use this thicker marker. I'm not exactly sure when he started using a secretary but he did sign authentically at one point. I started ttm in 2000 and by then they were fake.
It is Tony's secretarial I'm afraid, sorry... But don't waste that frame! His signature is out there enough, and examples from his later years aren't expensive. You could try and purchase one to frame, and if you are a fan of SLH, I've also seen this with Jack Lemmon (not with Marilyn though, hahaha...). I think your frame would look amazing with both their signatures displayed, alongside a poster from the film, much better than it would with a sec anyway :)