I know there is another reason. It's hard to remember full s/n..... too lazy to look up in the bound book, or too lazy to unlock the safe to find the full s/n. So, 321xxx
For many mass produced guns, minor variations was made in a few thousand volume, and are called "Transitional" by collectors, major variations were made in tens of thousands, and are entitled "Early", "Late", or "Standard", etc.... for most guns, the last 2 or three s/n digits are usually not important for communication purpose, unless the s/n appears very close on the boundary of transition, or it belongs to a very tiny variation, e.g. trial guns.
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