Sorry to be a dummy, but I'm still trying to work my around the enormous number of razor models and variations. Are you referring to a Fat Boy or a superspeed. I put 1958 and D4 into eBay and only came up with superspeeds. I am interested as i really like the idea of being anble to pull it apart and clean it out real good myself!
In D4 which is the last quarter of 1958 Gillette made the 195 "fatboy" as well as a Superspeed that they called the "TV" Superspeed. They also made their regular Superspeeds including if I recall correctly a Red Tip. I don't recall whether they made the blue and black tip that year. The TV was, as I understand it, named for television, but I have no idea why. That razor has different knurling than the regular Superspeed.
So yes, D4 195's exist. I have at least one. I don't believe I have any of the other D4 razors Gillette made.