Richard, OK thanks for looking. The "a" alternate makes more sense than a "d". The "a" is within the data range and the "d" is about 8000 numbers too high. If you would send a photo to me, or post it here, I can take a stab at the identification. AND thanks for the data!!
There is a section showing the various suffix in the Technical Information that Ed Tinker worked up. It shows a very good example of both a G-Date "a" and "d"!! That might also help.
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