I've collecting police-marked firearms for almost a decade now. They are a hoot to buy and shoot
Some of my favorites are
1) Indiana State Police S&W 66
2) California Highway Patrol S&W 60 and 68
3) Oklahoma Highway Patrol S&W 681
4) Austin PD S&W 28
5)USPS Postal Inspector S&W 36
6) USAF S&W 15
7) Wisconsin state patrol s&w 66
8) NYSP S&W 28
9) Kansas City S&W 4026
10) Texas DPS Bushmaster AR 15
11) Maryland State Police Beretta 92F
12) Kentucky State Police S&W 60, 66, and 686. Plus their Glock 17 Gen 4. And their Walther PPK
13) Louisville PD S&W 29, 10, and 67
14) NYPD S&W 10 and 5946. Sig P226 and Ruger Service Six
15) Tennessee Highway Patrol S&W 66 and 5906
16) Nevada DPS Sig P226
17) Illinois State Police S&W Remington 870
18) Florida Highway Patrol S&W 27 or 28 and their Glock 37
19) Arizona DPS S&W 15 and their Model 17 or 18 22LR trainer
20) Colorado State Patrol S&W 4006 and their 4013
I've got plenty more, but those are some of my cooler ones