Quick and dirty picture of my 4 2.5" Model 19s.
Top two are Department of State 19-5s with their signature matte black finish and .4" wide smooth "Combat" trigger. One has been lettered. From what I can gather, these were shipped with the standard panels but most are found on the market with Pachmyers. I've found at least one photo with the 19-5 wearing service panels in use. You'll notice the top gun has a more matte finish than the lower gun, being purchased in different batches. It's more of a satin finish like @WobblyPossum's. These guns tend to be in very good condition, having only been issued from 1986 to 1993 when the Diplomatic Security Service switched to the SIG P228. Additionally during the 80s, DSS Special Agents were subject to overly restrictive carriage policies which prohibited the carriage of weapons unless in the field on a criminal investigation or protection detail...so the guns spent a lot of time sitting in armories. Further, I believe many of the guns on the market to be spares from the armory/field offices, as from what I gather most of the issues guns were bought by agents from a distributor who bought them from State (this was prior to the CFR restricting resale of federal guns).
The bottom two guns are well worn beaters. The blued one has lots of finish wear and the action was worked over by Sandy Garrett. The other one is wearing NP3 and is a gun salvaged from a retired cop's boat in Montauk, NY. It's restoration is detailed further in this thread: https://pistol-forum.com/showthread....agnum-2-5-quot