What seems to be a stainless Colt Commander is used by Masao Kouda in "The Mysterious Mole Alien Case (Part 2)"
M1911A1
The M1911A1 is seen, strangely, with plainclothes Tokyo Metropolitan Police officers in the season. Most of the TMPD never use semi-automatics except for specialized units like the Special Investigation/Assault Team or the Security Police. While the M1911A1 has a history of use in Japan, only the Japanese Self-Defense Forces has a record of using them as the Allied Forces provided the pistols until they changed to the Minebea P9.
Revolvers
Smith & Wesson Model 15
A Smith & Wesson Model 15 appears to be used by Osaka Prefectural Police officer Yusuke Sakata aka Yusuke Inaba as his sidearm in "The Naniwa Serial Murder Case".
Smith & Wesson Model 36
A Smith & Wesson Model 36 appears to be seen in a next episode preview eyecatch in "The Naninwa Serial Murder Case". It appears to be seen throughout "Masked Yaiba Murder Case" as a key piece of evidence Conan use to pin Osamu Honda as the murder suspect.