1) Not to doubt your sincerity cmb56, but I lived
in NYC during the decades when these were first-line equipment and saw these bars every day. Lived with them, walked and drove past them operating hundreds if not thousands of times. I'm quite familiar with how the flasher bulbs looked, also quite familiar with how the color would fade on the red rotator bulbs and make them appear orange around the center of the bulb. Perhaps I'm a bit more familiar with these bars, than someone who just visited New York City for a few days in 1987.
2) If you look at the Fed Sig parts breakdown for the AeroDynic model 24, you'll see that the flashing lamps are specified as #4414. On the original AeroDynic they were used as end lamps, on the NYPD 24RMVF bar they were used as inboard flashers. However, same mounting assembly, same bulb:
http://www.fedsig.com/products/docs/par ... C-24CA.pdf
3) The #4416 spotlight bulb has an 11 x 4 degree beam spread, which makes it excellent for use as a spotlight or as a revolving beacon giving it a sharp flash, but means it is much too narrow to use as a fixed flasher. As a flasher with a 4 degree beam spread, if you are more than 2 degrees off the axis of the vehicle you have very little intensity, pretty useless when parked at a scene. It was common to use just the flashers while double-parked in traffic. With the correct bulb the flashers are plenty bright at a distance as well as off axis up close, as they were designed to be.
4) As for the 2Z, the bar I posted the picture of is one of several bought by myself at the auction. I went with a friend who worked for NYC and together we bought about 20 bars, he was going to resell his and I wanted a few for a project I had that never got past first base. I sold the others but kept one at home for display. I'm familiar with the old NYC Housing Police, Transit Police, Health & Hospitals Police, etc etc but there were none of those there that day. The bars we bought were all take-offs from blue & white NYPD vehicles, some were in pretty rough shape but after disassembling a bunch of them I don't recall any saying 2Z on them. And I've seen many NYPD bars.
I'm not going to dispute what other people might own, or think they own, but having been born there, lived there and having bought it from the horse's mouth, I know what's genuine. I have no doubt that your special order replica bar made for you by Fed Sig and shipped to Europe instead of to NYPD says 2Z, but the dozens of real NYPD bars I've seen don't say that. Maybe there were different series purchased by NYC over the years, I don't know. I would have to think mine which is marked "Series A1" is the original. If you look on the internet there are a few references to 24RMVF-2Z but they ALL reference the same Youtube posting where the poster says "yes i know im missing one red bulb." The same quote and reference has been picked up on websites in China, Japan, Germany, Brazil and elsewhere but it's all a copy of the same single quote. That hardly counts as "verification." And remember that you're basing your comments on your own special order bar which was never owned or used by NYPD.