Large military flare

Know a little about sun flares but nothing about military flares. Friend who buys and rehabs houses found this in a house he is working on. He would like an ID of this.

1.5" diameter, 3.8"long, rim dia 1.86" Brass base .59 high. What looks likes a standard shotshell battery cup primer with a nickeled primer. Tan paper case. Wad with black printing: GREEN TRACER above dividing stripe, below stripe RED GREEN. Mouth of case has top to bottom .122" green band, .209" red band, 209" green band.

First line case printing: SIGNAL CARTRIDGE MK IV Second line: CONTRACT NO. NORD 4175. Third line: MANUFACTURER I.F.S. Div. Fourth line: LOT NO. 251. Fifth line DATE MAY 1944. Sixth line INSPECTOR G.H.B.

Just above the top of the brass is a 1 at an angle. To the left of the printing is a large anchor with rope. No headstamp or marking on head.
Also what flare projector was this used in?

It is a WW2 U.S. Navy flare, used with the 37mm flare guns carried in aircraft. There are a number of variations with different color combinations for the star colors and the tracer color.

These could be used for signals during radio silence, or in event of radio failure.

Not real common, but not terribly scarce either.

The 1 1/2 inch ( “37mm”) Flare was used by the Airforces of both UK and USA. The discharger was a stubby Webley Pistol type affair, with locking lugs on the barrel, so that it could “slot and turn” into an adaptor on the top of the Canopy or Fuselage of the aircraft ( usually 2 engine or four engine Bomber or recon a/c.). They were used as signalling devices in flight, and for Takeoff commands. Also when working in conjunction with surface craft, in anti-submarine patrols. ( where radio silence was important).

Doc AV

Your color marking would indicate a green & red star “burst”
(indicated by the “thicker” two lower color bands)
with a green trace (the upper most “thinner” color band)

As follows are some common examples

You can see several “three band” examples that can be interpreted with the same logic as above

Thanks for the replys. Almost a modern version of the old Coston flares. Anyone know who the manufacture IFS was? Am assuming the small crooked 1 near the top of the brass was an internal inspectors number as it is obvious that it was hand stamped. Any old military flyers out there know what the different signals represented? Guess that is one of the reasons why you could not be in the service if you were color blind.