Thinking out loud. I have a late grade 2 lifter with grade 3 Damascus barrels that measure just a touch under 29 7/8" for a lettered 30" barrel gun. I think one of the reasons was to use up the old style barrels before the top action guns came out(thanks Dean for explaining that to me!).
Could this be a similar situation? Using up some old stock? Though I think Parker's last damascus gun was 1926. Drew had mentioned these were higher grade barrels for GH. Just thinking and reaching a bit...
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