Any idea when NYPD stopped issuing them? From above this seems to be 2002 production unless I've read wrong.
Also well past the typical U-based serials that seemed to match NYPD.
As far as I can tell, both 5946 and 3914DAO were produced for NYPD up thru at least 2013. I believe there was a previous post somewhere back in time with a list of Approved NYPD pistols which changed over time. I assume they were delisted and replaced by the lighter "plastic" pistols.
The Product Code 149332 NYPD spec 5946 included UCK (2011) and UCU (2013) which appear to be routine production - I have a Holton UCU97xx dated by SW as 3/22/2013 and confirmed by Roy to be "a major NY Police Dept".
They seem to stop in 2013 with none made in 2014, but with additional UCV and UCW prefix Houlton marked pistols (dated 2015-16) surplussed. The 5946 production continued with UCY pistols produced with indented S/N on Right but with Springfield markings in 2016 (presumably surplussed?)
The Product Code 103922 NYPD spec 3914DAO included UCS and UCT (2012) and UCU (12/2012 & 1/2013 per SW). These appear to be routine production concurrent with other Houlton production (primarily 3914DAO, 3953TSW, 4566TSW, 5946, but with an odd 5904 and a 5906 I stumbled upon).
The UCV and UCW prefixes (2015-16) 3914DAOs appear to be mixed Houlton and Springfield markings with INDENTED right side S/N and appear to have been surplussed. The 3914DAO production also continued 2015-17 with Springfield markings but NON-INDENTED UCZ s/n markings STILL ON RIGHT side of frame. The quantity of 3914DAO made with Springfield markings is unknown but appears to be mostly UCZ62xx serial numbers (5 of 6 observed UCZ 6209-6256). At least 83 3914DAO were sold to Lipseys in Baton Rouge, La in October 2017
Interestingly in the same 2013 time frame Houlton was producing melonite 4566TSW for WV State Police and WV Public Safety (Product Code 150933) in the UCU series in 2013-14 and what appear to be surplussed Houlton marked 3953TSW (Product Code 404541) in the UCV series in 2013-2015.