Hi Johhny,
The color photo in H. Jones' book, "Luger Variations" (reprinted in 1975) in the first few pages of the book, does show a unique "hook" to the shape of the trigger. Photo caption says it is the Norton Gun with a photo credit to Norman Lee.
I would scan and post it here, but I think a book copyright is still in place. Send me your private email to "pebbink@ pacbell.net" and I can send you a scan...if you want...
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />