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198 Posts

Posted - 07/02/2014 :  10:51:01 PM  Show Profile Send hunterman1 a Private Message  Reply with Quote
What is the approximate date and serial number IBM switched to the round bolt?


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Posted - 07/03/2014 :  1:51:42 PM  Show Profile Send Tuna a Private Message  Reply with Quote
By about January 1944 for IBM. (one of the first ones if not the first.) But they did have problems with bolts in this time frame so the flat bolts are also correct at that time.
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477 Posts

Posted - 07/03/2014 :  4:18:14 PM  Show Profile Send BQ97 a Private Message  Reply with Quote
IBM was the first manufacturer to switch to the round bolt doing so in late November, early December 1943. Serial number range would be in the upper 3.7 million.
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