This goes along with the topic of this thread as well as another article in the Parker Pages a few issues ago about barrel steels in Parker barrels.
I just came into this set of 2 frame 12g barrels that are NOS, unchambered and 32" in length. No serial number length. They have bottom ribs, loop, spacers and keels in place, but no top rib installed yet. The barrel flat has the blank circle on it as discussed in that PP article. Letter was stamped in on e the grade of gun was determined.
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These barrels are going to go on a check-hook lifter frame I have to upgrade into an A or AA grade.