I'll take "police vans" for $1000. Antedating 'paddy wagon' to (1914)

[Sam Clements]

Hopefull I've searched the archives this time and won't screw it up the way
I did with "Black Maria."  Sorry George.

The OED and M-W both have 1930 for "paddy wagon."

>From the Washington Post, March 15, 1914:  p.1 of the miscellany section,
col. 5-----

In an article entitled "Lingo of the Old-Time Thief"--from the Chicago
Tribune

     "A "peetman" is a safeblower, and when he blows a safe he "cracks a
joint."  If he is caught and taken to the station in the "paddy wagon" he
may be given "six months in the buck" or a "long bit" or a "short bit."