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IBM AO 3906262 |
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Ron_brock
Recruit Joined: Jan 07 2016 Location: Michigan Status: Offline Points: 11 |
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I'll add my serial number to the discussion. Apologies on the adjustable sight. Need to get that off and get a replacement. If these were stamped with one die, it sure had a lot of slop between the digits to allow for the misalignment seen below. I would tend to believe the number was applied in more than one hit.
Ron
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Marty Black
Moderator Group Editor in Chief Emeritus Joined: Dec 30 2015 Location: Pismo Beach, CA Status: Offline Points: 100339 |
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It IS hard to believe that IBM - which made business machines, of course, before the war - was so sloppy in their serial numbering. Sloppy IBM numbers are the norm, not the exception. We might've expected sloppy numbers from, say - a hardware company -like Std Pro, or a company that made steering gears, but not from IBM. With those awful leading 3's on so many serial numbers, you would've thought that the Ordnance Inspectors would've gotten on their case.
We've seen a few sloppy numbers on the other manufacturers' carbines, reported to the Carbine Club over the years, but those are the exceptions. With IBM, we have come to expect sloppy numbers. Interesting stuff....MB |
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Marty Black
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NewScotlander
Grunt Advanced Collector Joined: Jan 02 2016 Location: New York Status: Offline Points: 682 |
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I don't think the IBM made receivers have serial numbers which are too bad. It's mainly the later IBM/AO receivers that have the sloppy numbers.
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4656 |
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If you ever seen a roll stamp machine in action and consider the following facts:
that it used a rotating number head that received more linear then force then probably designed for. This is due to the fact that where the serial number goes is not a perfect radius. More downward force would be applied to insure that the whole number was deep enough. We have seen serials where it was so deep that the base of the number stamp left a line at beginning and end of number. AO had some issues going on with parts it was contracted to make. I would bet losses lead management to make cuts where it could. So they most likely did what they could to keep existing tooling like the number stamp unit going. |
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Marty Black
Moderator Group Editor in Chief Emeritus Joined: Dec 30 2015 Location: Pismo Beach, CA Status: Offline Points: 100339 |
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This S'G' makes the average IBM receiver look pretty good! Enjoy, MB |
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Marty Black
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Looks like it has been added. Thanks and thanks to Newscot for providing it. |
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1st M1 88
On Point Joined: Aug 26 2016 Location: illinois Status: Offline Points: 279 |
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The highest serial number you mention as 3,907,689, is this AO receivers or I.B.M.
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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According to CCNL 329 in 2005, the highest IBM SN in the club's database: AO receiver: 3907689 IBM receiver: 3968546 |
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RClark9595
On Point Joined: Oct 30 2017 Location: WVC Utah Status: Offline Points: 136 |
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Is it possible, (this is my Monday quarter back mind) since receivers can't be stamped after they are hardened, is it possible that AO had a hardening issue and left it up to IBM to finish stamping and hardening, that's just an idea. I'm not familiar with all the processes so this is just a guess. Adjustments have to be made from time to to time to keep production rolling, this may just have been one of them.
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Ron
USAF 4535 CCTS F4 Combat Crew Training Vietnam era Vet. |
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MalteseHawk
Recruit Joined: Apr 02 2016 Location: Easley, SC Status: Offline Points: 2 |
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My IBM (AO) #3840195 seems to have the smaller font and is very evenly spaced with all numbers in a straight line.
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PIfarmer
Recruit Joined: Jan 03 2018 Location: Hawaii Status: Offline Points: 17 |
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SWANEEDMB, send it to my email I'll resize it with Microsoft Paint and send back. I'm getting so good at this, I'm starting to scare myself. mmmchall at yahoo
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carbinecanuck
On Point Joined: Feb 04 2017 Location: Western Canada Status: Offline Points: 94 |
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Just recently ended up with a carbine that has an AO marked IBM receiver.
This is the first of this variation for me, so I was digging around the forum for anything interesting and/or relevant to them. Finding this post, I noticed that the serial number on the one I have, is less than 2000 numbers from the OP's serial. I seems to my eye there is similarity to the first digit (3) but the second number (9) certainly seems to be a different font. As mentioned previously, the roughness to the serial stamping is amazingly poor, compared to most other carbines I have come across. Kind regards -TT |
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Courage is fear holding on a minute longer. - GEORGE S. PATTON
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Nice. A very sloppy stamp. The 3 looks like it is wearing a top hat.
Are you near Richmond BC? |
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4656 |
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It seems that the first 3 numbers were stamped separate or another theory is that the first 3 were stationary. I surmise this because those digits are subject to more of a beating because they do not rotate frequently.
From a cost perspective as well as repair that having 3 fewer numbers rotating would be better. If a rotating die breaks you have to take the whole unit apart vs. a stationary die to swap out. Some roll marks from some manufacturer have been seen where the numbers were not close to being even.
It would seem the number 4s observed on the AOs posted here are all open top. Looking at yours they are smaller than the last 2 letters. Looking closer it appears that there are open top fours under the closed top fours. |
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carbinecanuck
On Point Joined: Feb 04 2017 Location: Western Canada Status: Offline Points: 94 |
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I see what you mean with the different style 4s.
In the first two AO marked receivers of that group picture, the 4's are closed top. Upon close inspection of mine, I would say it is the same style of 4 as what is seen on the second receiver in, with the double 4 at the end. And you are right, the closed 4 is stamped over what does look to be open top 4s. Neither 4 on my receiver is stamped on the same line, nor in line with any of the other numbers. Quite the mess really.
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Courage is fear holding on a minute longer. - GEORGE S. PATTON
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SSNPingjockey
On Point Joined: Mar 07 2020 Location: NC Status: Offline Points: 225 |
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Here is another later IBM/AO receiver with sloppy/deep roll-die marking.
Can actually see the outline of the roll-die block in IBM and the "P" looks double stamped. Just added to this older post for reference purposes.
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Chad
USN Retired |
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Smokpole
Hard Corps Joined: Oct 21 2019 Location: Madison ohio Status: Offline Points: 1057 |
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You guys got me looking at the serial and markings on my IBM/AO lineout to NPM. serial number is 3842078. The serial numbers are all small font and are perfectly spaced and even with each other. The AO is small font but slightly tipped toward the 1 o'clock position and slightly to right of center. The N mark is located above the bevel and below the serial number and slightly to the left of center.
Sorry, but I'm having a problem getting photos right now.
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OGCA Life member
NRA Life member Ashtabula Rod and Gun Life member |
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painter777
Hard Corps Joined: Feb 18 2016 Location: Central MI Status: Offline Points: 1718 |
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Not a AO, but also thought I should add since it looks like a match to Chads Deep I.B.M. Stamp Charlie-P777
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Living Free because of those that serve.....
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