Hey Luke,
Good query...
Unfortunately, both of my 1920's shooters have been rebarreled...
But in the For Sale section, Thor has posted some nice photos of a 1923 Commercial (aka 5-digit DWM, if you follow the Still terminology...) that displays the halo on the barrel SN.
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />