Near as we can tell they MIGHT be old palmettos or maybe 1960's Uberti or ASM but the clues don't really line up.
ASM Dragoons and Walkers have a characteristic scrollwork between the banners on the cylinder occasionally with partial serial number stamping.
ASM also was the only maker of large frame (and small frame) clones early on.
Replica Arms and Navy arms bought their medium frames from Uberti but the Dragoons and Walkers from ASM until Uberti started making all three size clones.
All generations of Colts leave that space unengraved except for the stamped serial number.
Some manufacturer filled the space with crosshatching but I can't remember if it was Palmetto or Uberti.
ASM was the only maker of 3rd model Dragoons to include the sight on their military version.
If the Paterson has a date code, it may help pin down the maker.
Mainardi (MOFRA) was the first Italian gun maker to clone the Paterson from the late 1960's to 1970/1.
Euromanufacture (Mainardi brothers) made the same Paterson from then until bought out by Palmetto around 1980.
Palmetto made the same Paterson for a short time I believe but by then Uberti and later Pietta had entered the market with their versions.
So if it is 1960's it was MOFRA, 1970's Euromanufacture (Double Diamond,) very early 1980's maybe Palmetto and later, Uberti or Pietta.
I believe all the Pietta made Patersons have "Texas Paterson" on the top barrel flat.
The only Uberti Paterson I have seen with an engraved top barrel flat inscription is a Commemorative.
The Paterson is one of the few clones that ASM never made.
Good Luck!
P.S. I just saw a cased Navy Arms Paterson AF (1980) with "FAP" in a diamond cartouche on the butt strap so Pietta was in the game at least that early! Its the earliest Pietta or Uberti Paterson that I have seen.