HP Forum Archive 21

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Re: recent HP 35 "Red Dot" on Ebay Message #1 Posted by JoeGeller on 26 Feb 2012, 6:03 p.m. The tantalum capacitors (silver hermetic cases) also have date codes. Visible in the picture are "7347", and "7319" (usually year and week), so it's at least from 1973 unless someone later changed some components (unlikely, they look like originals). There are four or five other capacitors with date codes not visible in the picture. With other 73 marks on the chips, it's almost certainly from '73 manufacture date.

Re: recent HP 35 "Red Dot" on Ebay Message #2 Posted by D. Taylor on 27 Feb 2012, 3:49 a.m., in response to message #1 by JoeGeller The board above was from another calculator. Here's the board from 1143A00026, which shows all early '72 dates:

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