Hey Pete.. (OH - I have to get your MAG in the mail!!! thanks for the reminder
!!)
Anyway - the "7" is indeed covered in Gibson's book, but only somewhat superficially, as you know. The "theory" that I presented above, is my theory after examination of various post-war HKs.
Honestly - there are 4 distinct variations of "post-war" that I'm working on documenting, and once it's complete over the next 6 months to a year - I'll post it here in the LugerForum and to the HK collectors I chat with. Anyway - my "7" observations come from my work and analysis, rather then Mr. Gibson's excellent work...
Best to you!
John