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Marks and Symbols for the P7 Family
The most obvious thing is the Serial Number.  It will appear on both the slide and frame.  It is XX826 on the left image, 86912 on the right image.  More about Serial Numbers is below.

The next thing you might notice is the US importer, HK in Chantilly, VA.  US importers are required to stamp or engrave their name on any guns they import.  All the "official" HK imports will be by HK in Chantilly.  Some "gray market" imports may show other importers

The Date Code is circled in red on the first image, IG.  It is IE on the second image.  More on Date Codes below.

The M13 or M8 (obviously) mean it is an M13 or an M8.  Without an M number, it is likely a PSP.  If the magazine has the release at the bottom, it is a PSP.

Note the marks in the second picture are all shiny, bare steel.  This is because they are applied by the proofing house after the gun has been completed and finished by HK.  The serial number was also applied last by HK, and is also bare steel.  If those marks are not shinny as in the first image, the gun has been refinished (or the owner put a dab of cold bluing on them).


Every gun in Europe must be sent to an independent Proofing House.  They will fire the gun with a "proofing load" -- a round overloaded with powder.  If the gun doesn't explode, they will stamp their marks on the slide and frame -- on the barrel itself sometimes, especially if the gun has interchangeable barrels.  The "bird" is a "Federal Eagle" and with the "N" under it that means the gun was proofed with smokeless power, Nitrocellulose.  The "antler" is the sign of the proof house, in this case one in Ulm.  Experts will tell you HK uses this proofing house exclusively but that isn't true, you may see other proofing house marks.

The Mystery Mark

Some P7 pistols were imported into the United States that have had a certain mark removed from the slide prior to export from Germany:

I am told BWB means the German "Bundesamt für Wehrtechnik und Beschaffung" which translates to "Federal Bureau of Military Technical Procurement."  It also could be "Bundeswehr Wehrtechnik und Beschaffung" which transaltes to "Federal Armed Forces Defense Technology and Procurement", as the Germans refer to their armed forces as the Bundeswehr.

Date Codes

In the date coding system, each letter corresponds to a number.  The letter 'J' is skipped for proofed firearms, but is present on magazines. 
The P13 above was manufactured in "IG" or "86" or 1986.   The P7M8 above was manufactured in "IE" or "84" or "1984." 
Digit 0 1 2 3 4 5 6 7 8 9
Firearms A B C D E F G H I K
Magazines A B C D E F G H I J

Serial Numbers

Below are supposedly the serial number prefixes for each model. 

Prefix Gun
x5- P7 PSP
x6- P7M8
x7- P7M13
18- P7K3
USA- P7K3 Imports
x1- P7M10

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