Rich,
The 655 is simply a consecutive number, identifying the person/team who tested and approved the guns, so that when flaws were discovered during use, the responsible acceptant could be traced back.
These numbers are interesting because they can be used to trace an inspector's career as the inspector took his number with him if he went to another location. They also can give clues as to where and when the gun the stamp is found on was produced.
The 655 in itself is just a number, nothing more, nothing less.
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