Hello Doc,
I spoke with Ron Wood after having seen this carbine...
Ron did confirm that the "vertical" Crown/N proof appeared around 1921 and beyond...switching from the Lazy C/N to the vertical C/N.
Sorry we could not get you over to my side of the SF Bay to see this piece. Actually, it was a surprise for me as well. I was just stopping by to pick up some luger books the Owner had borrowed from me and he just popped out this carbine.
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />