Dave I totally agree with you about the inspectors or acceptance marks. I am sure ther were many more that were removed during striking and final machining. We have restored several sets of barrels both twist and laminated, that do not come close to any other patterns that we have seen.
I believe that Parker produced laminate and twist barrels for a short period of time. These barrels seem to carry partially obilterated numbers, two and three digit, on the tubes ahead of the flats. Given the consistency of the various types of Dam. patterns that Parker used, I tend to think that they never successfully made Dam. Barrels.
We are trying to tie the unknown marks to specific contractors by date, Hopefully we can create a timeline for the barrel contractors. As for rib materials, we can not establish any logical pattern, but we will keep trying.
Brad
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