Thanks for your post, G Dog.
I looked at the Wiki article, and depending upon how one reads it, there is (to me) one mistake insofar as the pricing of the Colt 1860 Army vs. the Remington 1863 NMA concerning Army contracts. Somewhere in Charles W. Pate's Colt 1860 Army book is mentioned that the reason Remington got an Army contract in 1863 was because Colt was overcharging the Government for his guns (compared to civilian pricing) and the Remington NMA was far less expensive to procure.
IMO, the Wiki chart was created by the author of the article and not by Flayderman. Flayderman is also a bit confusing using his terminology of "scaled down", which I read as either different frame size, or barrel size, or both.
I have Flayderman's Guide 5th Edition (1990) (which does not have a similar chart) that states (pg. 144) the New Model Police .36 5-shot was made from 1863-1873 (not 1865-1873 on the chart) and is not a pocket model. Said to be a scaled down version of the Navy and Belt models, but does not have a rebated cylinder, which indicates to me that it used a Navy frame.
Flayderman also states (pg. 143) that the 1863 NMA had at least 3 "transitional" models using parts from the 1861 Army.
So, who knows if the different Pietta models are or are not correct?
Regards,
Jim