You are absoloutly right it "may" be whatever your flavour is. Since the ad was for a MV a vehicle type firex would be expected. Not one for a kitchen.
from left to right
Aquired from the remains of a 43 MB Canadian made Pyrene brass label marked Heavy vehicle Type.
Aquired from the remains of a 1945 Dodge APT weapons carrier Canadian made Pyrene brass label marked Heavy Vehicle Type.
Aquired from my inlaws kitchen 1930's or 40's Though it could be earlier as the patent is 1915. Canadian made Pyrene brass label.
Aquired from a bunch of army surplus items British military Pyrene painted olive green, decal label, W^D marked with a 1954 date.
From the G503
G503 FIRE EXTINGUISHERS
1 QUART
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Complete TM 9-1799 FIRE-EXTINGUISHERS Includes CO2 Kidde-Lux, CCI4 Fire Guard and Fire-Gun No 0 1 Quart Extinguishers 9Mb
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Several manufacturers Supplied Fire Extinguishers for the GPW and the MB.
The following extinguishers were installed at the Willys Overland factory on some MBs:
Fyr-Fyter Co. #D-10A
Gen. Fire Truck Corp. #BF-100-B
Documentation is dated 1/26/44 ( Thanks to Mark Tombleson)
Acceptable Brands - To Date.
Pyrene (Heavy Vehicle Type) (Extinguisher and Chemical Co.)
FIRE GUN - No. 0 American La France Foamite Co.
SOS Fire Guard (The General Detroit Co.)
Fyr-Fyter
General Quick Aid