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Old 10th June 2013, 11:12 AM   #10
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Join Date: Dec 2004
Location: Portugal
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If they are small numbers ( I II III IV ) they could be for assembly control. The French (and not only) fancied such system. In those days the gun parts were hand made and not all came out with the same precise dimensions; this way in the final assembly they could join the parts that were made to fit one each other in the beginning of the production line.
This is only a suggestion, of course .
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