Drew, I cannot get a decent photo of the 'Diamond Ps'. After careful examination, I would say that they were stamped on the individual barrel tubes prior to mating them up and soldering/brazing together. As Brad mentioned above, they have been partially obscured by machining processes. I will post a photo of the barrel flat markings. They will show up fine. Cheers!
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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