Description
Restored M84A1 Time Fuze for the 81mm M301A3 Illumination Round
Item Overview
This restored M84A1 time fuze is the nose component used with the 81mm M301A3 illumination round. Offered as an inert collectible, it suits a collection of U.S. mortar ammunition and fuzes. Its original role was to control the release of a parachute flare, helping troops see a selected area after dark. The model belongs to the Cold War development of infantry mortar ammunition.
Identification and Features
The military design used a brass head and body with an external timing ring. Its graduated scale and raised setting features helped crews identify the time marks in low light. These details are shown in the Army's illustrated ammunition references.
- Model: M84A1
- Type: Powder-train time fuze
- Application: 81mm M301A3 illumination round
- Location on service round: Nose
- Army assembly drawing reference: 9232784
- Condition: Restored, inert collectible
Function
The M84A1's original job was to control when the illumination round released its flare. It used a powder-train delay, meaning that burning material created the timing interval. When that interval ended, the fuze initiated an expelling charge that released the illuminating candle and parachute from the projectile. The parachute slowed the candle's descent while it gave off visible light.
Documented Applications
The Defense Department's 1980 Fuze Catalog identifies the M84A1 as the nose fuze for the M301A3 cartridge and lists Army and Marine Corps users. Government ammunition records document M301A3 use with the M1, M29, M29A1, and M252 81mm mortars. Army firing table FT 81-AI-3, dated March 22, 1973, also covers this illumination cartridge for the M125 and M125A1 mortar carriers. These records connect the fuze's parent round to both portable infantry mortars and tracked mortar systems.
Product History
The M84A1 developed from the earlier M84, retaining its basic layout while changing the material used in the time train. The M84 had a timing scale of up to 25 seconds; the M84A1 extended that scale to 50 seconds and used a tungsten compound delay. Army ammunition data sheets list an entry for standard classification dated 1965 for the M84 and M84A1 series. The M84A1 also had its own production specification, MIL-F-14716. Revision A was issued on March 22, 1971, with later amendments recorded in 1982 and 1992.
Equipment History
The M301A3 continued the M301 family of 81mm illumination cartridges. Army data sheets record its standard classification in 1968. Earlier M301A1 and M301A2 rounds used the M84 fuze, while the M301A3 used the M84A1. The complete illumination round combined a projectile body and fins with a candle and parachute. Its historical service performance included at least 500,000 candlepower of light for at least 60 seconds. Military specification MIL-C-14909A, issued March 15, 1971, specifically documented production of the M301A3 with the M84A1 fuze.
Weapon-System Background
The U.S. 81mm mortar family grew from the French Brandt design used as the basis for the M1, which saw wide use during World War II. The lighter M29 began replacing the M1 in 1952 and served with infantry units in Vietnam. The M252 followed through joint development by the United States and Britain, completed in July 1984, and began replacing the M29 in 1987. These weapons used a tube, bipod, and baseplate for high-angle indirect fire. Their ammunition families included high-explosive, smoke, and illumination rounds, giving infantry units several forms of support from the same mortar system.
History of Use
Visible-light illumination rounds helped troops observe the ground and identify movement at night. Government records describe M301A3 use in combat and on training ranges. A specific later example appears in Army research report ERDC/CRREL TR-06-10, which documents M301A3 rounds with M84A1 fuzes fired from M252 mortars at Fort Richardson, Alaska, in January 2006. The exercise involved the 1st Battalion, 501st Parachute Infantry Regiment, and included illumination firing after nightfall. This documents continued use of the M84A1 with the M301A3 decades after their Cold War development.
Condition
This M84A1 fuze has been restored and is offered as an inert historical collectible. The listing is for the fuze itself; the M301A3 illumination round is its documented application.
Ideal For
This restored fuze fits collections focused on U.S. mortar ammunition, Cold War infantry equipment, and military illumination systems. It can also support an exhibit explaining how an illumination round released its parachute flare. The verified M84A1 designation and Army drawing reference make it useful for comparing physical components with period ammunition manuals and diagrams.
- U.S. mortar ammunition collections
- Cold War ordnance displays
- Military illumination exhibits
- Restoration reference collections
- Museums and military-history groups
Approx length 4", Approx width 3", Approx height 3", Approx weight 1.7 lbs.
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