A serial number with no suffix indicates that the gun was manufactured in the first block of that calendar year. Suffixes were added to the following blocks of guns for the calendar year. The next calendar year this process was started over.
Given that there were about 10,000 guns in each block, it is interesting that your magazine has a matching serial number. What are the odds that an exact matching serial numbered no suffix magazine is with your gun? If the magazine is original to your gun, some inspector slipped up IMHO.
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