Dan,
There are no features which allow one to differentiate between a P-08 frame and an LP-08 frame.
On the LP-08 reciever, don't forget the cut at the reciever front for the rear sight. This applies to DWM Lugers; Erfurt Lugers had the cut on all guns after 1917, but only made LP-08 in 1914.
--Dwight
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