The following weapons were used in the film Joker:
WARNING! THIS PAGE CONTAINS SPOILERS!
Smith & Wesson Chief's Special
Arthur Fleck aka "The Joker" (Joaquin Phoenix) uses a Pre-Model 36 version of the Smith & Wesson Chief's Special throughout the film.
Smith & Wesson Pre-Model 36 "Chief's Special" - .38 Special
The revolver is seen lying in the package along with several cartridges. Note the screw between the hammer and the cylinder, identifying it as a variant of the Chief's Special made just prior to the model numbering system used by S&W (in this case, what would become the Model 36).
Arthur Fleck rehearsing with the Smith & Wesson in his apartment.
Arthur with the S&W Chief's Special.
A clown-masked rioter is armed with what appears to be a nickel plated M1911A1.
Nickel Plated M1911A1 - .45 ACP
The gun can be seen in the rioter's holster.
The rioter pulls out his nickel 1911.