The gun advertised as a Commercial Artillery at Joe Salter -
https://www.joesalter.com/category/p...ger-by-DWM-9mm - falls right in the middle of the 2,000 gun .30 cal Safe/Loaded range. Without a matching number on the barrel, I would have to agree with George and think that it was a standard .30 cal S/L gun with the barrel replaced later.