The 8.81 is the land diameter in mm.
The 'Z' is part of the serial number. I believe, (someone will give the correct answer), serial numbers would go from 0001 to 9999 to 0001 A to 9999 A to 0001 B....... if you get the idea. I'm not sure when they restarted, (change in year etc..), but to be on the safe side to completely identify a gun you really want the serial number, suffix letter and year of manufacture. There were certainly several Lugers made with your serial number, 39XX, so without the extra info the gun isn't uniquely identified.
I suspect that for some periods when more than one manfacturer was in operation you want to include that as well ! (ie Erfurt and DWM).
Hope that is a) correct and b) helps !
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