Kerilynn, Your 2 most recent photos show a decent 0 grade early Parker minus a hammer and hammer screw. Being a plain steel, gun it is my understanding it wouldn't have foreign sourced barrels . Hopefully others with "Plain Steel" barrels or other barrels of the same period can comment on the initials partially covered by the bottom rib. I don't remember my 2 somewhat earlier lifters having any similar initials but I don't have them handy at the moment. The Parker Story lists some early Parker employees and their job functions. If the initials can be identified, someone with the book handy might be able to match them to a barrel man at Parker B. or not.
You can check to see if a research letter is available for your gun by visiting the home page. One is probably available since the stock book for this serial range is available. Don't know how extensive the info in a letter might be until one is ordered.
Erick
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