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Can anyone Identify this?

I bought this from a flea market. I'm not sure which country built it and I'm having a hard time finding any infromation. There are numbers on the very bottom. M71A1 and MA-1-2. Can you help me?
 

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Looks like a tailboom for a US 81mm mortar, no books in front of me right now for the model.
 
This one has the closest profile of any in TM 43-0001-28
 

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I think it's an M375. I can't find picutres or numbers to confirm but that data sheet looks really close. No other common US mortar comes close.
 
While the expansion tube is different, the fins are similar. It is stamped M24. Have yet to find anything pertinent with an M71A1 designation.
I have this item identified as an 81MM M374A1 w/M524 fuze.
 

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That's not it. The holes do not go all the way to the top of the fins like your motar. They are roughly two inches from the top of the fins.
 
Grinder

Uh, yes, I know. Apologies for not being more exact in text. Point being made is: the fins are not specific to any given model. (Expansion)Tube variations abound, apparently. This is a process of elimination as there are no references identifying the original item in question, just yet. I checked all of my other examples. This is the only one with that profile. It is marked M24. It is different in a number of respects, but the fins are very close to the same. They are a component part of an assembly. I've shown what I've got. Helping to narrow it down and answer your question.

Rick
 
Grinder, your example is the older Vietnam style that took powder bags around the boom. It tapers up to the steel body. The photos that Slick posted are from a more recent version that uses U shaped combustible powder "doughnuts" to hold the propelling charge. Your boom would go on the M374 HE or M375 WP projectiles.
 
Grinder

Uh, yes, I know. Apologies for not being more exact in text. Point being made is: the fins are not specific to any given model. (Expansion)Tube variations abound, apparently. This is a process of elimination as there are no references identifying the original item in question, just yet. I checked all of my other examples. This is the only one with that profile. It is marked M24. It is different in a number of respects, but the fins are very close to the same. They are a component part of an assembly. I've shown what I've got. Helping to narrow it down and answer your question.

Rick

Ah ok thought you were comparing it. So Vietnam era then? I was hoping it was WW2. It's kinda cool to look at though. I wish mine wasn't all blown apart though haha.

Thanks for all your help by the way, I appreciate it.
 
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HAZORD's ID as an M375(at the least), confirms the "bell" shape of the expansion tube noted in the TM data and drawings previously posted.
And I learned about the bag vs donut charges. Hadn't even thought about that before. Thanks, Haz.

Rick
 
U.S. 81mm M374 tailfin...

Hello grinder1933

The tailfin belongs to the 81mm M374 HE mortar shell also. Here is a photo of one that is stamped:RMK-1-12 1971 M170.

Best regards,

Randall
 

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Slick, your mortar that you pictured is the M374A3 (M374A2E1) that uses the M24 tail boom. It is almost identical to the M889 81mm HE except for the use of the M524 series fuze while the M889 uses the M923 (a 60mm M567 put in a booster cup assembly to fit the 81mm). The tail boom for the original thread is, as stated, for the M374 series HE mortar shell. I think it is the M170, which is supposed to have better waterproofing than the M149, which had a circular shroud around the base of the fins.
 
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