That is his secretarial version. It's been that way for since at least the mid 1990s. I think there's a new secretary signing now. I always thought it was his son, Barry, since the autographs I got from him on a photo with his secretarial dad autograph looked like his he was trying to do a different style. But I would think Barry would be a bit too busy to do this for many years. It also can't be Dick's wife since he had different wives at different period.
Sorry I don't have closer up views of his autograph at the moment, but I threw this image of the 4 together back in 2011/2012 soon after getting him IP over two evenings (and his brother back at the venue of "The Sunshine Boys", pic with Jerry says 9/9/2011.) The D's are totally different in your orig post, for starters. I don't know his ttm habits but trust those here that do.
Thanks a lot, Todd, for taking the time and your efforts! The differences between my piece and your in-persons are obvious, even given the time gap between 1997 and 2011. He must have written so many autographs in his life that his writing can't have changed that much in older years.