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 I.B.M.
 ibm barrel
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murbas
Greenhorn Member


USA
25 Posts

Posted - 01/07/2018 :  10:04:17 AM  Show Profile Send murbas a Private Message  Reply with Quote
had a a question about my newly aquired ibm. the ibm barrel is marked near the sight I.B.M. CORP. without a date, and there is a P proof mark about 4" from the barrel band. there is also a horizontal keyway just behind the sight. is that keyay supposed to be there and be visible? also, can anyone date this barrel? thanks all, mike.

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BQ97
Advanced Member

477 Posts

Posted - 01/07/2018 :  2:36:00 PM  Show Profile Send BQ97 a Private Message  Reply with Quote
Yes

I.B.M. stopped dating barrels during or after December 1943.
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Jackp
Veteran Member



USA
1064 Posts

Posted - 01/07/2018 :  2:41:51 PM  Show Profile Send Jackp a Private Message  Reply with Quote
IBM barrels do have the horizontal key way you describe.

JackP
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murbas
Greenhorn Member



USA
25 Posts

Posted - 01/07/2018 :  5:37:00 PM  Show Profile Send murbas a Private Message  Reply with Quote
what was the key way used for?
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Jackp
Veteran Member



USA
1064 Posts

Posted - 01/07/2018 :  6:02:27 PM  Show Profile Send Jackp a Private Message  Reply with Quote
Same as the other style. It was just the way IBM chose to finish the end of the key slot. I guess they used s straddle mill instead of an end mill to make the slot. Probably was a faster process.

JackP
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