I've been told and my experience bears it out, that Taurus makes limited runs of uncataloged models. For example, I saw a snub nosed, medium frame (5 shot), Model 44C - 44 Mag in a gunshop in PA. I could not find that model listed on the Taurus web site. I also couldn't find it at any other dealer or even a dealer who knew what I was talking about.
It took members here, one who had one and one who had seen one on GunBroker (I think) to find one for me.
Why they would distribute uncataloged items I don't know.
Unless that is, the same person who is in charge of the on-line catalog also runs their customer service...