It could be the last three digits of a serial number, or, it is an assembly number. Often, individual components of a gun are numbered to keep them all together during the manufacturing process, prior to the application of the actual serial number. I don't recall seeing any 'assembly numbers' on the parts of any of my Parkers, though.
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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