I'm in Dave's camp re that Parker Bros sourced their barrels from as many as four different suppliers. I simply can't ignore the fact that the circle stamped in the right barrel flat containing the letter code for the designated barrel steel were all of the same diameter and that the letter stamp is observed as being located virtually anywhere within that circle, rarely in exactly the same position. That coupled with the fact that we have seen unfinished barrels with the circle stamp and even the HT/A but without that final barrel steel letter designation stamp.
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