The entire set of Luger Blueprints is available from me on CD. See my "sticky" at the top of the For Sale column. I recommend this CD to everyone who needs Luger dimensions...
But here is the information you requested:
The front sight dovetail is shown upside down so you can read the numbers easier, because that is how they appear on the print.
All measurements are in Millimeters, you will have to do your own Imperial conversions...