Mark the subject of ribs seems to be a study in its self. We have documented rib use by year of manufacture, and have yet to establish any logical pattern use , prior to what I would call the typical 4 wire patterns, most often used on latter barrels.
I would assume that Parker purchased steel for ribs, from the same suppliers that furnished tubes. Many of the patterns match. Some of the patterns are way out in left field. No rhyme or reason.
Plain steel rib materials were more readily available, which is why we believe that your barrels may of been produced by Parker.
Brad
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