Don't know anything about -68s, but coincidentally this -67 that I no longer own was built the day before yours. The SN on the one I used to own is really close to the one Michael Collins wore on Apollo 11. I remember reading somewhere that the last 321s were made in November 1968, but I don't recall the source.
EDIT: Just saw your correction that yours is from August 68. Mine was a -67 from the last days or weeks of cal 321 production.
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