When was mossberg 385 kb with serial number 10322370 made?

The Mossberg 385KB is a model that was produced in the early 1970s. Based on the serial number you provided (10322370), it is likely that this shotgun was manufactured around 1974. Mossberg typically used a sequential numbering system, so the specific date can vary, but it generally falls within that timeframe. For precise dating, consulting Mossberg's production records or a dedicated firearms historian would be ideal.