My newest, a Pietta 1860 Army. Destined for a bespoke 5-shot .44 Colt cartridge conversion, but as few visual changes as possible. I think the 1860 Army is one of the most elegant and beautiful firearms ever made.
1851 Avenging Angel cartridge conversion in .38 Colt short.
1851 Avenging Angel with a Kirst gated conversion in .45 Schofield, cased with a hand-made single shot derringer in .450 Adams.
Armi San Marco 1858 with a bisley-style grip and lowered hammer-spur, chambered in .44 Colt.
1849 'Wells Fargo' cartridge conversion in .32 S&W
S&W .38 Single Action, 2nd model
Pietta 1858 'Bulldog' cartridge conversion in .45 Colt
EMF New Dakota by Armi San Marco chambered in .45 Colt.
1849 cartridge conversion in .251 TCR
Pietta 1858 with Kirst gated conversion in .45 Colt
Cimmaron Richards-Mason conversion Avenging Angel in .38 Special
Hawes Western Marshall .45 Colt
Armi San Marco Walker cartridge conversion in .44-55 Walker
1849 Pocket model cartridge conversion in .22 LR
US Arms Abilene .44 Magnum
There might be another one or two around, but this is most of them.