These started out as 6.5" Fourth Model 44 Special Targets. Shipped in April and August of 1955. One went to St. Louis and the other to New Orleans. In 1970 they were in the possession of the same owner who sent them to S&W and one had its barrel cut to 5" while the other received a replacement 5" barrel. Maybe the last one they had in inventory since the other was cut rather than replaced.
I bought them in 2005. I bought one and when I told my wife about seeing the pair and buying one she said "Why didn't you get both?" I couldn't think of a good answer so I called the dealer and bagged the second one.
Picked this up around 1987 or so. Wife got me the ivory stocks for my birthday a few years back.