Q:  What are the various import markings on P7 pistols?

A:  The import markings signify who imported the P7. 
The various importers for the P7 pistols include:

 

HK Inc Arlington, VA
 

HK Chantilly, VA

HK Sterling, VA

 

HK Inc. Sterling, VA
with the "Warning" label
(AA Date Code and above)

 

C.I.A. (Century International Arms)
re-import of an HK Sterling gun

PW Arms (Imported lots of P7s from BMI and other German Agencies)

 

HKI Trussville, AL (AG-2006)

 

"Davidson's Greensboro, NC"
marked P7 M13 (Unusual)